npix_to_nside

cygrid.npix_to_nside(uint64_t npix) → uint64_t

Compute HEALPix nside from npix.

Parameters:

npixuint64_t

HEALPix npix parameter.

Raises:

ValueError

Invalid value for npix.

Notes

This function was adapted from the HEALPix C++ library. (Copyright (C) 2003-2012 Max-Planck-Society; author Martin Reinecke; see http://healpix.sourceforge.net)