[Scilab-users] FFT doubt

[Samuel Gougeon]

Hello,

Le 08/05/2014 20:34, andre.regis13 at gmail.com a écrit :
> Dear colleagues,
>
> I have two functions f1(x) and f2(x). Using the following formula:
>
> to calculate the results, get: 5.125[units].
> I tried to calculate separately by F1=fft(f1) , F2=fft(f2) and then 
> multiply stems one by one and adding the results. I found two problems:
This is a question about numerical computing rather than Scilab itself.
Anyway, why do you use some FFT instead of some straightforward 
integration function (such as intg()) ?
FFT would be useful whether the expected result would be e.g. the 
cross-correlation function of your f1() and f2() ;
but it is not the case : no lag appears in the integrand between 
arguments of f1 and f2...

HTH
Samuel

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