[Octave-bug-tracker] [bug #43742] ifft, ifft2, ifftn should accept 'nonsymmetric' and 'symmetric' options

[Hg200]

Follow-up Comment #18, bug#43742 (group octave):

The conclusion in comment #13 was to not use the "real part" trick to solve
this problem.

I am working on a complete new patch containing "a full C2R implementation"
and i am in the testing phase now.  I can release this in the next weeks. This
new patch will clarify many open points:

1.) A new FFTW "C2R" planner for complex to real transformations for double
and float precision. This means that "symmetric" transformations are handled
natively by the correct FFTW code.
2) The FFTW code "C2R" works differently than "R2C" or "C2C". "C2R" destroys
its input data. This is taken into account.
3) Asymmetries in the input data are removed by a "make symmetric" cleanup
function --> Here the "real part trick" has a very big problem!!
4) New macros for SIMD alignment for better readability.
5) BISTs



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