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IndexError for N-dimensional real FFT #119

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vtavana opened this issue Aug 13, 2024 · 0 comments
Open

IndexError for N-dimensional real FFT #119

vtavana opened this issue Aug 13, 2024 · 0 comments

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@vtavana
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vtavana commented Aug 13, 2024

Following example returns an error

#  Name        Version   Build              Channel
# ────────────────────────────────────────────────────
#  numpy       1.26.4   py311h689b997_3  intel  
#  numpy-base  1.26.4   py311h913173e_3  intel
#  mkl_fft  1.3.8    py311h977b55c_72  intel

import numpy
b=numpy.arange(24.).reshape(2, 3, 4)
numpy.fft.rfft2(b, axes=(1, 2), norm="forward").shape
# ...
# IndexError: list index out of range

while stock NumPy works correctly

#  Name  Version   Build              Channel
# ──────────────────────────────────────────────
#  numpy  1.26.4   py312heda63a1_0  conda-forge

import numpy
b=numpy.arange(24.).reshape(2, 3, 4)
numpy.fft.rfft2(b, axes=(1, 2), norm="forward").shape
# (2, 3, 3)

For the same example, there is no issue, if norm is None or "backward".

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