FFT requires capacity which is larger than the maximum computer capacity

tewyme · December 8, 2011, 10:17

I encountered this error, when I tried to do the FFT in x direction for a 3D array, I think this is because howmany=2359296 is larger than the maximum capacity for a 32 byte computer (2^31), so I am eager for any potential resolution for this, thanks a lot
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File "./change_energy_spectra.py", line 46, in egy_spe
arr_F=rfft(arr,nx,-1)
File "/usr/lib64/python2.7/site-packages/scipy/fftpack/basic.py", line 201, in rfft
return _raw_fft(tmp,n,axis,1,overwrite_x,work_function)
File "/usr/lib64/python2.7/site-packages/scipy/fftpack/basic.py", line 49, in _raw_fft
r = work_function(x,n,direction,overwrite_x=overwrite_ x)
_fftpack.error: (n*howmany==size(x)) failed for hidden howmany: drfft:howmany=2359296

cfdnewbie · December 12, 2011, 14:37

I'm no expert in this, but it looks like you are linking 64bit libs, so I assume you have a 64bit system?!
Did you check your memory requirement during runtime?

December 8, 2011, 10:17	FFT requires capacity which is larger than the maximum computer capacity	#1
tewyme New Member non Join Date: Nov 2011 Posts: 3 Rep Power: 16	I encountered this error, when I tried to do the FFT in x direction for a 3D array, I think this is because howmany=2359296 is larger than the maximum capacity for a 32 byte computer (2^31), so I am eager for any potential resolution for this, thanks a lot ----------------------------------------------------------------------------------------------- File "./change_energy_spectra.py", line 46, in egy_spe arr_F=rfft(arr,nx,-1) File "/usr/lib64/python2.7/site-packages/scipy/fftpack/basic.py", line 201, in rfft return _raw_fft(tmp,n,axis,1,overwrite_x,work_function) File "/usr/lib64/python2.7/site-packages/scipy/fftpack/basic.py", line 49, in _raw_fft r = work_function(x,n,direction,overwrite_x=overwrite_ x) _fftpack.error: (n*howmany==size(x)) failed for hidden howmany: drfft:howmany=2359296

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December 12, 2011, 14:37		#2
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 557 Rep Power: 21	I'm no expert in this, but it looks like you are linking 64bit libs, so I assume you have a 64bit system?! Did you check your memory requirement during runtime?