[AstroPy] fftw3

Marshall Perrin mperrin at stsci.edu
Fri Jun 24 13:07:14 EDT 2016

Dear Bruno,

We use pyfftw as an optional dependency in our poppy physical optics library.  Our application is for complex wavefront propagation rather than convolutions but it still shows how to use the library, including the planning setup which I agree is not that well explained. For example code you can look here:


 - Marshall

On Jun 24, 2016, at 11:17 AM, Bruno O. Sánchez <bruno.sanchez.63 at gmail.com<mailto:bruno.sanchez.63 at gmail.com>> wrote:

Hello guys,

I am an astronomer from Córdoba Argentina, and I work a lot with astropy. I have been working on proper coaddition of images with spatially variant PSF, and I am currently using the convolution from astropy and scipy.

I've encountered some perfomance issues, and noticed that there is some previous discussion on the settings of astropy.convolution.convolve fft engines.

I wonder if any of you have succeded in setting a fftw3 engine for convolution, and if you have a snippet for using it. The fftw3 planning stage confuses me, and I can't find a documentation on pyfftw3.

Any clues you can give me for this would be greatly appreciated!

Observatorio Astronómico de Córdoba

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