Volume 526, February 2011
|Number of page(s)||9|
|Section||Numerical methods and codes|
|Published online||07 January 2011|
Libpsht – algorithms for efficient spherical harmonic transforms
Max-Planck-Institut für Astrophysik,
Accepted: 1 November 2010
Libpsht (or “library for performant spherical harmonic transforms”) is a collection of algorithms for efficient conversion between spatial-domain and spectral-domain representations of data defined on the sphere. The package supports both transforms of scalars and spin-1 and spin-2 quantities, and can be used for a wide range of pixelisations (including HEALPix, GLESP, and ECP). It will take advantage of hardware features such as multiple processor cores and floating-point vector operations, if available. Even without this additional acceleration, the employed algorithms are among the most efficient (in terms of CPU time, as well as memory consumption) currently being used in the astronomical community. The library is written in strictly standard-conforming C90, ensuring portability to many different hard- and software platforms, and allowing straightforward integration with codes written in various programming languages like C, C++, Fortran, Python etc. Libpsht is distributed under the terms of the GNU General Public License (GPL) version 2 and can be downloaded from http://sourceforge.net/projects/libpsht/.
Key words: methods: numerical / cosmic background radiation / large-scale structure of the Universe
© ESO, 2011
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