README

This directory contains Fortran code for the 1D, 2D and 3D NUFFTs.

dirft*d.f contains direct evaluation schemes for verification/testing, where * = 1,2,3

nufft*df90.f contains NUFFT routines of types 1,2,3 with dynamic F90 workspace allocation.

nufft*df77.f contains NUFFT routines of types 1,2,3 with static F77 workspace allocation in the calling (driver) routine.

next235.f contains a utility routine that finds a highly composite integer greater than a given number.

dfftpack.f contains a double precision FFT package from Netlib.

nufft*d_demof77.f contains a sample driver routine for the F77 versions of the codes.

nufft*d_demof90.f contains the analogous driver for the F90 versions of the codes.

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Simply compile

nufftd_demof90.f nufftdf90.f dirft*d.f dfftpack.f next235.f

or

nufftd_demof77.f nufftdf77.f dirft*d.f dfft.f next235.f

Release notes: c c NUFFT 1.2 : Jan 20, 2009. c First external release. c c NUFFT 1.3 : Nov 28, 2011. c Adjust parameters and constants for double/quad precision. c Add Matlab/Octave wrappers and mex files. c c NUFFT 1.3.3 : Nov 8, 2014. c Mergerd into a single release for all dimensions c with minor fixes, documentation modification. c