Segmentation fault when R2R transform

[simonlegrand]

Segmentation fault when R2R transform

[rainwoodman]

I am not very familiar with R2R transforms, and the support to it in the binding is thus not finished.

I'll really appreciate if you can help me to finish this part of the binding.

[rainwoodman]

I added a PR that fixes the segfault, but I am not sure if this will cover your use case. Could take a look at it at #9?

[simonlegrand]

Thanks a lot, it works and it covers my first use cases. I just started working with R2R, not really familiar with it yet neither. I'll let you know if I have working test cases.

[rainwoodman]

The last paragraph here is a bit relevant.

http://www.fftw.org/fftw3_doc/The-Halfcomplex_002dformat-DFT.html#The-Halfcomplex_002dformat-DFT

I think what was written there is saying using all R2HC transforms in > 1 dimensions does not make proper Fourier transforms; so you'll have to be very careful about what you do in this special 'spectral space'.