#+TITLE: spherelib
#+STYLE: <link rel="stylesheet" type="text/css" href="org.css" />
#+AUTHOR: M. Le Jeune
#+DATE: 2013-02-21 13:58:59 CET
#+EMAIL: lejeune@apc.univ-paris7.fr

The spherelib package extends the healpix functionnalities. It includes: 
+ a c++ librabry (/lib)
+ a python package (/python)
+ a needlet ilc binary (/nilc) See NILC_README.org for more info 

* Installation of the python package

** Dependencies

The spherelib python package relies on healpy python package
(https://github.com/healpy/healpy) and Healpix C++ library.  
The Healpix software provides both (http://sourceforge.net/projects/healpix/)
The healpy package can also be installed through =pip= tools.  

The following libraries are also required: 
+ *GSL*
+ *FFTW3*

The *swig* program is used to interface c++ with python, together with the numpy
core headers (in particular numpy/arrayobject.h)


** Installing the spherelib python package

  =cd spherelib/python=
  =./waf configure --healpix_prefix=$HEALPIX/src/cxx/$HEALPIX_TARGET --prefix=$HOME=
  =./waf install=
  =export PYTHONPATH=$HOME/lib/python2.6/site-packages:$PYTHONPATH=
  =export LD_LIBRARY_PATH=$HOME/lib:$LD_LIBRARY_PATH=


* Using the C++ library