get inverse fourier Optimization, how can i do?

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denis bertin 2017-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/357445-get-inverse-fourier-optimization-how-can-i-do

编辑： denis bertin 2017-9-29

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Hi everyone,

I have these attached file name: datineltempo_ciclico.m that read file name malta1t.mat,

in th line 95, there is the peace of code like this:

NPF = 942;
N=2001;
v=381x1;(complex numbers)
f=381x1;
t=1x2001;
for(k = 1:NPF)
                        v = datif2(:,k);
                        g = zeros(2001,1);
                        du=f(2)-f(1);
                        for k1=1:N
                           integrando=exp(i*2*pi*t(k1)*f).*v;
                           g(k1)=du*sum(integrando);
                        end
                        v1 = g;
                        v1 = 2 * real(v1);
                        datit(:,k) = v1;
                        %k
                    end
.....

The problem is that is take more time to load the 942*2001 matrix;

Please somebody can i help me optimize(make faster) this loop?

Many thanks.

I need the maximum time reduce execution...

Please Help Me....

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Answer 1

Christoph F. 2017-9-20

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The "clean" solution would be to use MATLABs fft()/ifft() functions. They are optimized and also work for vector sizes that are not a power of two.

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denis bertin 2017-9-20

编辑：denis bertin 2017-9-20

Thank you Christoph, but i don't know how can do it without modify the current result. Please help me with the code,then i would learn how you are done it. I attached to problem all necessaries files.

Many thanks.

denis bertin 2017-9-29