How can I plot the graph of this double integral function in Matlab?

Question

Comfort Sekga 2022-9-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1814050-how-can-i-plot-the-graph-of-this-double-integral-function-in-matlab

编辑： Walter Roberson 2022-9-28

I'm trying to plot the a graph of eta against r but I'm getting errors.

r = linspace(10^-2,10^2);
for delta = [1 2 3 4 5 6]
    f=@(x,y) x.*exp(-3.44.*r.^(5./3).*x.*(sin(y./2)).^(5./3)).*cos(delta.*y);
    eta = integral2(f,0,1,0,2*pi);
    plot(r,eta)
    loglog(r,eta)
end

How can i plot the graph of the integral? Thanks in advance!

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Answer 1

David Hill 2022-9-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1814050-how-can-i-plot-the-graph-of-this-double-integral-function-in-matlab#answer_1062760

在 MATLAB Online 中打开

r = linspace(10^-2,10^2);
eta=zeros(size(r));
hold on;
for delta= [1 2 3 4 5 6]
for k=1:numel(r)
  f=@(x,y) x.*exp(-3.44.*r(k).^(5/3).*x.*(sin(y/2)).^(5/3)).*cos(delta*y);
  eta(k) = integral2(f,0,1,0,2*pi);
end
plot(r,eta)
end