Why do I get 'Out of Memory' error?

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Susan on 9 Jun 2021
Commented: Susan on 9 Jun 2021
Hi All,
I have a dataset which contains 316663 cells, each cell contains either a 600-by-1 or a 300-by-1 matrix. I got the error when I execute the following code
X_fft = cellfun(@fft,Data,'UniformOutput',false);
Any idea how can I solve this issue?
Thaks in advance!

Accepted Answer

Joel Lynch
Joel Lynch on 9 Jun 2021
Out of memory is exactly what it sounds like: your program is trying to hold more data on system memory than is available. The cell array alone around (316663*400*8/1e9=1) GB of memory, plus overhead, not to mention the memory required during FFT calculation. You can run
at a breakpoint before this line to see exactly how much memory it takes up. You can also make sure other programs (especially web browsers) are not hoarding memory using your computer's system monitoring tools.
If that doesn't free-up enough memory, you need to reduce how much is being used by MATLAB at any one time. Most likely, you do not need to store all cell arrays on memory at once. So you can break up the problem into chuncks, running FFT on a section of data at a time.
Susan on 9 Jun 2021
@John D'Errico Thanks for the note. Good to know that!
Susan on 9 Jun 2021
@Joel Lynch@John D'Errico For breaking up the problem into chuncks, I take fft using 3 for loops to get the results. Is there a way that I can do that without using the for loop?

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