MATLAB: Reimann sum and numerical integration

integrationnumerical integration

I am trying to solve the functions below numerically using MATLAB
This is my code where I have used "integral" command to solve for the second integral, while I used Reimann sum to solve for the first. Take for example c=1/128.
    x= -1/128:0.0001:1/128;
    for j=1:length(x)
        den= @(y)  pi^2.* sqrt(1- (x(j)+y).^2) .* sqrt(1- y.^2);
        fun= @(y) 1./den(y);
        ymin= max(-0.999,-0.999-x(j));
        ymax= min(0.999,0.999-x(j));
        pdfX(j)=integral(fun,ymin,ymax);
    end
    sum1=0;
    for j=1:length(omegat)
       func1(j)=pdfX(j)*0.0001;
       sum1=sum1+func1(j);
    end
    F=sum1;
Do you think it is correct? Are there any other ways to make it more accurate?
Thanks

Best Answer

I would likely use either trapz or cumtrapz to calculate ‘F’, but otherwise I see no problems.
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