nside2npix

Function to provide the number of pixels N_pix over the full sky corresponding to resolution parameter N_side.

Location in HEALPix directory tree: src/C/subs/chealpix.c 

FORMAT

long nside2npix(const long nside)

ARGUMENTS

name&dimensionality	kind	in/out	description
nside	long	IN	the Nside parameter of the map.
nside2npix	long	OUT	returns the number of pixels Npix of the map Npix=12Nside2.

EXAMPLE:

npix= nside2npix(256);

Returns the number of HEALPix pixels (786432) for the resolution parameter 256.

RELATED ROUTINES

This section lists the routines related to nside2npix

ang2vec

converts $(\theta,\phi)$ spherical coordinates into (x,y,z) cartesian coordinates.

vec2ang

converts (x,y,z) cartesian coordinates into $(\theta,\phi)$ spherical coordinates.

npix2nside

converts N_side into number of full sky pixels N_pix.