solve equation numerically 1=(1/y)x*exp(x*y)

hi,

please, i want to solve numerically the following equation in matlab: 1=(1/y)x*exp(x*y)

Sincerely

Answer 1

[Bruno Luong]

Numercial solution

y = 0.01:0.01:1;
x = nan(size(y));
for k=1:length(y)
    yk = y(k);
    x(k) = fzero(@(x)x.*exp(x.*yk)-yk, 0.5);
end
plot(x,y)
xlabel('x')
ylabel('y')

[belghazdis mohammed]

thank you very much for your answer. when i tried to apply your algorithm on my real equation which is

0.016=(44/y)^(1/2)*x^(1/2)*exp(-(y/44)*x^(5/3))

x = 0.01:0.1:1;
y = nan(size(x));
for k=1:length(x)
    xk = x(k);
    y(k) = fzero(@(y)(44./y).^(1/2).*xk.^(1/2).*exp(-xk.^(5/3).*(y/44))-0.016, 0.5)
end
plot(x,y)
xlabel('x')
ylabel('y')

i get the following message:

Exiting fzero: aborting search for an interval containing a sign change

because complex function value encountered during search.

(Function value at -0.14 is -0.016+16.9576i.)

Check function or try again with a different starting value.

y =

NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN

[belghazdis mohammed]

Thank you very much for your help sir.

[belghazdis mohammed]

f=@(x,y)(44./y).^(1/2).*x.^(1/2).*exp(-(y/44).*x.^(5/3))-0.016;
[x,y]=meshgrid(0:0.02:1, 0:5000);
z=f(x,y);
contour(x,y,z,[0 0]) % the plot is empty

[Bruno Luong]

You should NOT to change the question, either you know the simplification is representative, either you don't then don't do it, this is wasteful for volonteer to answer the wrong question.

f=@(x,y)(44./y).^(1/2).*x.^(1/2).*exp(-(y/44).*x.^(5/3))-0.016;
[x,y]=meshgrid(0:0.01:1, 0:5000);
z=f(x,y);
c=contourc(x(1,:),y(:,1),z,[0 0]);
j = 1;
xy = c;
jrm = [];
while j <= size(c,2)
    jrm = [jrm, j];
    j = c(2,j)+j+1;
end
xy(:,jrm) = [];
xy = sortrows(xy',1);
x = xy(:,1);
y = xy(:,2);
for k=1:length(x)
    try
        y(k) = fzero(@(y)f(x(k),y), y(k));
    catch
        y(k) = NaN;
    end
end

Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -0.28 is -0.016+0.19469i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -0.56 is -0.016+0.16372i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -0.84 is -0.016+0.14793i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -1.12 is -0.016+0.13767i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -1.4 is -0.016+0.1302i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -1.68 is -0.016+0.1244i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -1.96 is -0.016+0.1197i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -2.24 is -0.016+0.11577i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -2.52 is -0.016+0.11241i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -2.8 is -0.016+0.10949i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -3.08 is -0.016+0.10691i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -3.36 is -0.016+0.10461i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -3.64 is -0.016+0.10254i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -3.92 is -0.016+0.10066i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -4.2 is -0.016+0.098936i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -4.48 is -0.016+0.097353i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -4.76 is -0.016+0.09589i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -5.04 is -0.016+0.09453i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -5.32 is -0.016+0.093261i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -5.6 is -0.016+0.092073i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -5.88 is -0.016+0.090957i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -6.16 is -0.016+0.089906i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -6.44 is -0.016+0.088913i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -6.72 is -0.016+0.087973i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -7 is -0.016+0.08708i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -7.28 is -0.016+0.086231i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -7.56 is -0.016+0.085421i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -7.84 is -0.016+0.084649i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -8.12 is -0.016+0.08391i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -8.4 is -0.016+0.083202i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -8.68 is -0.016+0.082523i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -8.96 is -0.016+0.081871i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -9.24 is -0.016+0.081244i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -9.52 is -0.016+0.080641i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -9.8 is -0.016+0.080059i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -10.08 is -0.016+0.079497i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -10.36 is -0.016+0.078955i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -10.64 is -0.016+0.078431i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -10.92 is -0.016+0.077924i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -11.2 is -0.016+0.077432i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -11.48 is -0.016+0.076956i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -11.76 is -0.016+0.076495i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -12.04 is -0.016+0.076046i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -12.32 is -0.016+0.075611i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -12.6 is -0.016+0.075188i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -12.88 is -0.016+0.074776i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -13.16 is -0.016+0.074376i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -13.44 is -0.016+0.073986i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -13.72 is -0.016+0.073606i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -14 is -0.016+0.073235i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -14.28 is -0.016+0.072874i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -14.56 is -0.016+0.072521i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -14.84 is -0.016+0.072177i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -15.12 is -0.016+0.071841i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -15.4 is -0.016+0.071513i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -15.68 is -0.016+0.071192i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -15.96 is -0.016+0.070878i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -16.24 is -0.016+0.070571i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -16.52 is -0.016+0.07027i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -16.8 is -0.016+0.069976i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -17.08 is -0.016+0.069688i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -17.36 is -0.016+0.069405i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -17.64 is -0.016+0.069129i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -17.92 is -0.016+0.068857i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -18.2 is -0.016+0.068591i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -18.48 is -0.016+0.068331i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -18.76 is -0.016+0.068075i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -19.04 is -0.016+0.067823i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -19.32 is -0.016+0.067577i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -19.6 is -0.016+0.067334i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -19.88 is -0.016+0.067096i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -20.16 is -0.016+0.066862i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -20.44 is -0.016+0.066633i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -20.72 is -0.016+0.066407i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -21 is -0.016+0.066185i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -21.28 is -0.016+0.065966i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -21.56 is -0.016+0.065751i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -21.84 is -0.016+0.06554i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -22.12 is -0.016+0.065332i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -22.4 is -0.016+0.065127i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -22.68 is -0.016+0.064926i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -22.96 is -0.016+0.064727i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -23.24 is -0.016+0.064532i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -23.52 is -0.016+0.064339i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -23.8 is -0.016+0.064149i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -24.08 is -0.016+0.063963i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -24.36 is -0.016+0.063778i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -24.64 is -0.016+0.063597i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -24.92 is -0.016+0.063418i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -25.2 is -0.016+0.063241i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -25.48 is -0.016+0.063067i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -25.76 is -0.016+0.062895i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -26.04 is -0.016+0.062726i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -26.32 is -0.016+0.062559i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -26.6 is -0.016+0.062394i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -26.88 is -0.016+0.062231i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -27.16 is -0.016+0.06207i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -27.44 is -0.016+0.061912i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -27.72 is -0.016+0.061755i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -28 is -0.016+0.061601i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -28.28 is -0.016+0.061448i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -28.56 is -0.016+0.061297i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -28.84 is -0.016+0.061148i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -29.12 is -0.016+0.061001i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -29.4 is -0.016+0.060856i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -29.68 is -0.016+0.060712i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -29.96 is -0.016+0.06057i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -30.24 is -0.016+0.06043i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -30.52 is -0.016+0.060291i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -30.8 is -0.016+0.060154i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -31.08 is -0.016+0.060018i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -31.36 is -0.016+0.059884i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -31.64 is -0.016+0.059751i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -31.92 is -0.016+0.05962i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -32.2 is -0.016+0.059491i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -32.48 is -0.016+0.059362i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -32.76 is -0.016+0.059235i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -33.04 is -0.016+0.05911i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -33.32 is -0.016+0.058986i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -33.6 is -0.016+0.058863i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -33.88 is -0.016+0.058741i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -34.16 is -0.016+0.058621i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -34.44 is -0.016+0.058502i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -34.72 is -0.016+0.058384i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -35 is -0.016+0.058267i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -35.28 is -0.016+0.058151i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -35.56 is -0.016+0.058037i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -35.84 is -0.016+0.057923i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -36.12 is -0.016+0.057811i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -36.4 is -0.016+0.0577i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -36.68 is -0.016+0.05759i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -36.96 is -0.016+0.057481i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -37.24 is -0.016+0.057373i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -37.52 is -0.016+0.057266i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -37.8 is -0.016+0.05716i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -38.08 is -0.016+0.057055i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -38.36 is -0.016+0.056951i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -38.64 is -0.016+0.056848i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -38.92 is -0.016+0.056745i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -39.2 is -0.016+0.056644i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -39.48 is -0.016+0.056544i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -39.76 is -0.016+0.056444i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -40.04 is -0.016+0.056346i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -40.32 is -0.016+0.056248i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -40.6 is -0.016+0.056151i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -40.88 is -0.016+0.056055i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -41.16 is -0.016+0.05596i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -41.44 is -0.016+0.055865i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -41.72 is -0.016+0.055772i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -42 is -0.016+0.055679i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -42.28 is -0.016+0.055587i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -42.56 is -0.016+0.055495i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -42.84 is -0.016+0.055405i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -43.12 is -0.016+0.055315i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -43.4 is -0.016+0.055226i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -43.68 is -0.016+0.055138i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -43.96 is -0.016+0.05505i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -44.24 is -0.016+0.054963i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -44.52 is -0.016+0.054877i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -44.8 is -0.016+0.054791i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -45.08 is -0.016+0.054706i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -45.36 is -0.016+0.054622i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -45.64 is -0.016+0.054538i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -45.92 is -0.016+0.054455i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -46.2 is -0.016+0.054373i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -46.48 is -0.016+0.054291i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -46.76 is -0.016+0.05421i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -47.04 is -0.016+0.054129i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -47.32 is -0.016+0.054049i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -47.6 is -0.016+0.05397i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -47.88 is -0.016+0.053891i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -48.16 is -0.016+0.053813i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -48.44 is -0.016+0.053736i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -48.72 is -0.016+0.053659i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -49 is -0.016+0.053582i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -49.28 is -0.016+0.053506i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -49.56 is -0.016+0.053431i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -49.84 is -0.016+0.053356i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -50.12 is -0.016+0.053281i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -50.4 is -0.016+0.053208i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -50.68 is -0.016+0.053134i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -50.96 is -0.016+0.053061i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -51.24 is -0.016+0.052989i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -51.52 is -0.016+0.052917i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -51.8 is -0.016+0.052846i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -52.08 is -0.016+0.052775i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -52.36 is -0.016+0.052705i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -52.64 is -0.016+0.052635i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -52.92 is -0.016+0.052565i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -53.2 is -0.016+0.052496i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -53.48 is -0.016+0.052428i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -53.76 is -0.016+0.05236i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -54.04 is -0.016+0.052292i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -54.32 is -0.016+0.052225i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -54.6 is -0.016+0.052158i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -54.88 is -0.016+0.052092i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -55.16 is -0.016+0.052026i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -55.44 is -0.016+0.051961i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -55.72 is -0.016+0.051895i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -56 is -0.016+0.051831i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -56.28 is -0.016+0.051767i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -56.56 is -0.016+0.051703i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -56.84 is -0.016+0.051639i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -57.12 is -0.016+0.051576i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -57.4 is -0.016+0.051513i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -57.68 is -0.016+0.051451i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -57.96 is -0.016+0.051389i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -58.24 is -0.016+0.051328i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -58.52 is -0.016+0.051266i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -58.8 is -0.016+0.051206i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -59.08 is -0.016+0.051145i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -59.36 is -0.016+0.051085i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -59.64 is -0.016+0.051025i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -59.92 is -0.016+0.050966i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -60.2 is -0.016+0.050907i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -60.48 is -0.016+0.050848i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -60.76 is -0.016+0.05079i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -61.04 is -0.016+0.050732i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -61.32 is -0.016+0.050674i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -61.6 is -0.016+0.050617i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -61.88 is -0.016+0.05056i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -62.16 is -0.016+0.050503i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -62.44 is -0.016+0.050447i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -62.72 is -0.016+0.05039i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -63 is -0.016+0.050335i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -63.28 is -0.016+0.050279i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -63.56 is -0.016+0.050224i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -63.84 is -0.016+0.050169i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -64.12 is -0.016+0.050115i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -64.4 is -0.016+0.05006i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -64.68 is -0.016+0.050006i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -64.96 is -0.016+0.049953i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -65.24 is -0.016+0.049899i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -65.52 is -0.016+0.049846i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -65.8 is -0.016+0.049794i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -66.08 is -0.016+0.049741i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -66.36 is -0.016+0.049689i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -66.64 is -0.016+0.049637i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -66.92 is -0.016+0.049585i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -67.2 is -0.016+0.049534i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -67.48 is -0.016+0.049483i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -67.76 is -0.016+0.049432i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -68.04 is -0.016+0.049381i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -68.32 is -0.016+0.049331i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -68.6 is -0.016+0.049281i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -68.88 is -0.016+0.049231i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered during search.
(Function value at -69.16 is -0.016+0.049181i.)
Check function or try again with a different starting value.
Exiting fzero: aborting search for an interval containing a sign change
    because complex function value encountered dur...

plot(x,y);

[belghazdis mohammed]

Thank you sir.

Answer 2

[KSSV]

syms x y 
f = 1==1/y*x*exp(x*y) 

f = 

solve(f,x)

ans = 

solve(f,y)

Warning: Solutions are only valid under certain conditions. To include parameters and conditions in the solution, specify the 'ReturnConditions' value as 'true'.

ans = 

[belghazdis mohammed]

Thank you very much for your answer. for me I am looking for the values of y when x varies between 0.1 and 1.

thank you in advance

[KSSV]

Read about subs

[belghazdis mohammed]

Thank you.