To find integral of a function in loop

Hi,

I am calculating integral of a function 'f' with respect to lamda. I want to calculate variable 'q' for all possible values given in range of variable 'x'. upper limit and lower limit of variable lamda is as same as in variable 'x'. But matlab function given an error. kingly ghide me. or matlab show output of a single value. I want to do these calculations as a vector.

x = [600*10^-9:5*10^-9:800*10^-9];
for i = 1:numel(x)
N=(15.*z.*T*((h.*c).^3));
f=@(lamda)((Pi.^4).*(lamda.^4)*(k.^3));
q = integral(f,6e-7, x);
 F=(N./q);
end

Answer 1

[Alan Stevens]

Try replacing

q = integral(f,6e-7, x);

with

q(i) = integral(f,6e-7, x(i));

[Nadia jabeen]

Now error has been removed. But only one value is appear for q(i). I want to plot a graph for all values of q(i). how can I store all these values in one variable?

[Alan Stevens]

q holds all the results! For example:

x = [600*10^-9:5*10^-9:800*10^-9];

% Arbitrary data - replace with your own
N=1; %(15.*z.*T*((h.*c).^3));
k = 10^3;
lambda = 10^4;
f=@(lamda)((pi.^4).*(lamda.^4)*(k.^3));

for i = 1:numel(x)
q(i) = integral(f,6e-7, x(i));
 F=(N./q);
end
plot(x,q),grid
xlabel('x'),ylabel('q')