the error here in equalization an ordinary variable in symbolic the error in E and says:" Conversion to double from sym is not possible." wt can ii do???

syms x;

 syms y;
rt=[x y];
xloc=[1 2 4 5];
yloc=[23 45 67 44];
N=4;

noOfratios=6;

 E=[ones(1,1),ones(1,1)]

%s=5*ones(1,length(N));

for i=1:N

    di=rt-[xloc(i),yloc(i)]

E(i,1)=1./(abs(di).^2);

end

for i = 1:noOfratios

    j = setdiff(1:noOfratios,i);
    k(i,j)=E(i)/E(j);

end

for i = 1:noOfratios

j = setdiff(1:noOfratios,i);

c(i,j)=r(i,2)-k(i,j).*r(j,2);

di=[xloc(i)-xloc(j),yloc(i)-yloc(j)]

p(i,j)=(k(i,j).*(abs(di)))./(1-k(i,j).^2)

end

Answer 1

[Walter Roberson]

Umm, exactly which line does it say it on?

And where did you get the idea that the single symbolic variable "r", which is never assigned a value, could be indexed at (i,2) and (j,2) at the Matlab level?

[SAM alimostafa]

E(i,1)=1./(abs(di).^2);in this line and i deleted r i don't use it

[Walter Roberson]

Is there a point in doing the abs() before doing the .^2 ? Are you expecting imaginary values or only real values?

[SAM alimostafa]

no points i want to ignore negative values and only real values is expecting