Function to provide the number of pixels ${N_{\rm pix}}$ over the full sky corresponding to resolution parameter ${N_{\rm side}}$ .

Location in HEALPix directory tree: src/f90/mod/pix_tools.f90

FORMAT

name & dimensionality	kind	in/out	description

nside	I4B	IN	the ${N_{\rm side}}$ parameter of the map.
var	I4B	OUT	the number of pixels ${N_{\rm pix}}$ of the map. If ${N_{\rm side}}$ is valid (a power of 2 in $\{1,\ldots,8192\}$ ), ${N_{\rm pix}}=12{N_{\rm side}}^2$ is returned; if not, an error message is issued and -1 is returned.

npix= nside2npix(256)

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

npix2nside: returns resolution parameter corresponding to the number of pixels.

Eric Hivon 2010-06-18

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