[scilab-Users] 2D fft

[Samuel Gougeon]

Hello,

fft bugs http://bugzilla.scilab.org/show_bug.cgi?id=7895
http://bugzilla.scilab.org/show_bug.cgi?id=9266
have been fixed on 2011-05-26 but for Scilab 5.4, as
for 95% of fixes and improvements made since the release of 5.3.2
mid-may.
So, everyone have either to wait for the 5.4 official release, or to use
the workaround given in the bugzilla threads, or to install a nightly built
release.

Regards
Samuel

PS: For a proper threading of messages, it would be nice to open a new
thread rather than renaming the topic of a rely. Thanks.


Le 18/10/2011 17:21, grivet a écrit :
> Hello,
>
> I have run into a problem using fft for nxn matrices. Here is a simple 
> example:
>
> x = linspace(0,10,512);
> y = exp(-x/2).*cos(5*%pi*x);
> m = y.*.y';
> n = fft(m);
> nr = real(n)
>
> When I plot any line or column of n, I get a nice damped sinusoid; in 
> other words, fft returned the original data.
> The same happens if I do n = fft2(m).
> Some bugs were reported for Scilab 5.1 and 5.2, but not for 5.3.2, 
> which I use under WinXP.
>
> Thanks for any suggestion or workaround,
> JP Grivet
>
>