Installation and Usage

  1. Install the finufft library, including all of its required libraries
  2. Download contents of sinctransform package, i.e. “git clone https://github.com/hannahlawrence/sinctransform.git”

Configuration

  1. In the makefile, change FINUFFT to the path to finufft:
FINUFFT = /some/path/to/finufft
  1. In the makefile, change FFTW to the directory containing the fftw library:
FFTW = /some/path/to/fft

(Note: on a Mac, this may be /usr/local/lib. On linux it is /usr/lib/x86_64-linux-gnu)

Testing

Run make all to build and test the library. All tests and examples should complete without error. The tests should run for less than 30 seconds.

Usage

To use in other programs, begin by creating the static library:

make lib

This creates libsinc.a, which should be linked against your code. In your code, make sure to include the header file:

#include "sinctransform.hpp"

The sinc functions also expect a complex<double> array for q (even if all the complex values are 0), so it will also be necessary to include the corresponding header:

#include <complex>

Then compile with both the sinctransform and finufft static libraries, e.g.

g++ -std=c++11 -Wall -g -o myprog myprog.cpp /path/to/libsinc.a /path/to/finufft/lib/libfinufft.a -lfftw3 -lm

It may be necessary to include a flag telling the compiler where to find the FFTW library, which is a prerequisite for the finufft library. To do so, add the flag “-L/some/dir” such that /some/dir contains the static FFTW library (.a file, in lib-static directory of finufft library).