
ang2vec
Routine to convert the position angles of a point on the sphere
into its 3D position vector (x,y,z) with
,
, .
Location in HEALPix directory tree:
src/C/subs/ang2vec.c
FORMAT
void vec2ang(double theta, double phi, double *vector);
ARGUMENTS
name & dimensionality 
kind 
in/out 
description 




theta 
double 
IN 
colatitude in radians measured southward from north pole (in
[0,]). 
phi 
double 
IN 
longitude in radians measured eastward (in [0, ]). 
vector(3) 
double 
OUT 
three dimensional cartesian position vector
(x,y,z). The north pole is (0,0,1) 
RELATED ROUTINESThis section lists the routines related to ang2vec

vec2ang
 converts the 3D position vector of point into its position
angles on the sphere.
Eric Hivon
20100618

