Healpix cxx

This page contains hints for using HEALPix's c++ classes. It's very much a work in progress, with things added as and when I discover them. If you have any suggestions/comments, please leave them on the talk page.

Compilation

You probably want to add the following libraries to your make command for your application:

-lhealpix_cxx -lcfitsio -lcxxsupport -lfftpack

The first of these is the main healpix one; the second deals with FITS input/output; the third provides various supporting functions and definitions, and is needed for FITS input/output. The fourth is the fourier transform pack.

Also, make sure that the healpix compile path looked at, via putting something like the following also in your make command:

-B$(HEALPIXPATH)/bin -I$(HEALPIXPATH)/include -L$(HEALPIXPATH)/lib

where

HEALPIXPATH = /Healpix/src/cxx/generic_gcc

... altered so that it points to your healpix compile path, of course. Otherwise, your program won't be able to find HEALPix, and will fail.

Creating a map

You need to include both healpix_map.h and healpix_base.h (or possibly just the former?). You can create the map using something like:

Healpix_Map<double> map = Healpix_Map<double>();
map.SetNside(HEALPIX_NSIDE, RING);

FITS output

You need to compile with both of the fitsio libraries above (cfitsio and cxxsupport), and include healpix_data_io.h, healpix_map_fitsio.h and fitshandle.h.

The third parameter, int datatype, of write_Healpix_map_to_fits can be one of the following:

TFLOAT
TDOUBLE
TINT
TINT32BIT
TSTRING