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A few more tweaks, and add the file nfft.dat of efficient FFT lengths.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4837 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor 2014-12-18 20:53:16 +00:00
parent 1889b24c78
commit c628013582
4 changed files with 2235 additions and 163 deletions
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5
lib/chkfft.txt
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@ -113,3 +113,8 @@ Test data for all transforms is gaussian random noise of zero mean and
standard deviation 1. Tabulated values of "rms" are the
root-mean-square differences between the original data and the
back-transfmred data.
File nfft.dat contains all numbers between 2^3 and 2^23 that have
no factor greater than 7, followed by their factors. These numbers
are good choices for FFT lengths.

2
lib/four2a.f90
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@ -19,7 +19,7 @@ subroutine four2a(a,nfft,ndim,isign,iform)
! This version of four2a makes calls to the FFTW library to do the
! actual computations.
parameter (NPMAX=100) !Max numberf of stored plans
parameter (NPMAX=2100) !Max numberf of stored plans
parameter (NSMALL=16384) !Max size of "small" FFTs
complex a(nfft) !Array to be transformed
complex aa(NSMALL) !Local copy of "small" a()

2067
lib/nfft.dat Normal file
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