[petsc-users] 1d FFT of 2D vector (using fftw for preference)

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> I do not know of one other than repeated calls to the 1D transform. If
> you can find it in the FFTW API when could put it in.

I used this:

  c->p_forward = fftw_plan_guru_r2r(1, &(c->tdim), c->rank-1, c->dim, x, c->work, &redft00, flag | FFTW_PRESERVE_INPUT);

https://github.com/jedbrown/spectral-petsc/blob/master/chebyshev.c#L127
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