<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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. <div><br></div><div>PAOLO: any hints?</div><div><br></div><div>Stefano B</div><div><br><div><div>On Sep 22, 2011, at 2:13 AM, dario rocca wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Dear Developers<br>I would be interested in calculating the FFT with a small reciprocal<br>space cutoff. Namely beyond the FFT for wavefunctions<br>and density I would like to use an additional FFT on an "object" that requires a cutoff smaller than the <br>
wavefunctions (but of course the real space mesh would still be the same). All the standard<br>FFT machinery seems very specialized to the<br>wavefunction/density case, and I was wondering if there is an easy option or if someone<br>
has developed more general subroutines and is willing to share them.<br>Thanks for your help<br>Dario Rocca, UCDavis<br>
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