Previous:
alter_alm*
Up:
HEALPix/F90 subroutines
Next:
angdist
Top:
Main Page
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/f90/mod/pix_tools.F90
FORMAT
call
ang2vec
(
theta
,
phi
,
vector
)
ARGUMENTS
name & dimensionality
kind
in/out
description
theta
DP
IN
colatitude in radians measured southward from north pole (in
).
phi
DP
IN
longitude in radians measured eastward (in
).
vector
(3)
DP
OUT
three dimensional cartesian position vector
(
x
,
y
,
z
)
normalised to unity. The north pole is
(0,0,1)
RELATED ROUTINES
This section lists the routines related to
ang2vec
angdist
computes the angular distance between 2 vectors
vec2ang
converts the 3D position vector of point into its position angles on the sphere.
vect_prod
computes the vector product between two 3D vectors
Previous:
alter_alm*
Up:
HEALPix/F90 subroutines
Next:
angdist
Top:
Main Page
Version 3.31, 2017-01-06