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Topic: Need help in doing fft for a large matrix
Replies: 2   Last Post: Feb 7, 2013 2:06 PM

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dpb

Posts: 8,288
Registered: 6/7/07
Re: Need help in doing fft for a large matrix
Posted: Feb 7, 2013 2:02 PM
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On 2/7/2013 7:34 AM, Gupta wrote:
> Hello...i ma trying to do abs(fft(y))) where y a large matriy of size
> 1x8388608. when i am running the code, at this line the program was
> getting terminated without running remaining commands. was the problem
> is with size of the matrix or memory of matlab or fft funtion. when i do
> this operation for a mtrix of size 1x4194304 it was working perfect.


Well, on its own

x=rand(1x8388608);
f=abs(x);

was no problem here w/ a machine w/ only 1GB actual memory on either
R121 or R2012b so by itself size wouldn't appear to be the issue--how
much other memory is being used at the time?

The combination of x and f above is only 128 MB; it almost certainly
requires another complex of the same size as working space plus some
other additional...

What error is given--is it memory or something else?

Post any error messages and the result of

whos

and/or

memory

--



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