On Sun, 20 Oct 2013 22:41:53 -0700 (PDT), gyansorova@gmail.com wrote:
>
>Over to you Vlad. Vlad the inhaler will help you out.
Hah, that's a good one.
Mark
Reply by niarn●October 21, 20132013-10-21
>Hi guys, i have a problem with fft2.
>I must find the autocorrelation matrix of a matrix s = 4x10000.
>
>The first and right solution is R = s*s'; <--matrix 4x4
>
>Now i want obtain the same result with fft2,so:
>
>o = fft2(s);
>kl = o*o';
>R = ifft2(kl); <- matrix 4x4
>
>But i see that the fourth column is different, while the others
yes..Why??
>
>
Try asking at dsp.stackexchange.com, maybe provide an example with some toy
input where the expected output is known....
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Reply by ●October 21, 20132013-10-21
On Sunday, October 20, 2013 9:37:33 PM UTC+13, Ste_ee wrote:
> Hi guys, i have a problem with fft2.
>
> I must find the autocorrelation matrix of a matrix s = 4x10000.
>
>
>
> The first and right solution is R = s*s'; <--matrix 4x4
>
>
>
> Now i want obtain the same result with fft2,so:
>
>
>
> o = fft2(s);
>
> kl = o*o';
>
> R = ifft2(kl); <- matrix 4x4
>
>
>
> But i see that the fourth column is different, while the others yes..Why??
Over to you Vlad. Vlad the inhaler will help you out.
Reply by Ste_ee●October 20, 20132013-10-20
Hi guys, i have a problem with fft2.
I must find the autocorrelation matrix of a matrix s = 4x10000.
The first and right solution is R = s*s'; <--matrix 4x4
Now i want obtain the same result with fft2,so:
o = fft2(s);
kl = o*o';
R = ifft2(kl); <- matrix 4x4
But i see that the fourth column is different, while the others yes..Why??