[petsc-dev] FFT of multi-component system

Matthew Knepley knepley at gmail.com
Mon Dec 19 09:10:08 CST 2022

I have a 12-component system, and want the FFT of each component, so
something like

  FFT \otimes I

You could almost do this with KAIJ, but the FFT matrix is not AIJ. Is there
another nice way to do this?



What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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