[Pw_forum] FFT on a small mesh

[Stefano Baroni]

I know that Paolo Umari has already implemented this feature in "his" GW codes, and possibly in pw.x as well. Don't know, though, if in his private version or in the svn one. 

PAOLO: any hints?

Stefano B

On Sep 22, 2011, at 2:13 AM, dario rocca wrote:

> Dear Developers
> I would be interested in calculating the FFT with a small reciprocal
> space  cutoff. Namely beyond the FFT for wavefunctions
> and density I would like to use an additional FFT on an "object" that requires a cutoff smaller than the 
> wavefunctions (but of course the real space mesh would still be the same). All the standard
> FFT machinery seems very specialized to the
> wavefunction/density case, and I was wondering if there is an easy option or if someone
> has developed more general subroutines and is willing to share them.
> Thanks for your help
> Dario Rocca, UCDavis
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---
Stefano Baroni - SISSA  &  DEMOCRITOS National Simulation Center - Trieste
http://stefano.baroni.me [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype)

La morale est une logique de l'action comme la logique est une morale de la pensée - Jean Piaget

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