healpy.rotator.rotateVector¶

healpy.rotator.rotateVector(rotmat, vec, vy=None, vz=None, do_rot=True)¶

Rotate a vector (or a list of vectors) using the rotation matrix given as first argument.

Parameters :

rotmat : float, array-like shape (3,3)

The rotation matrix

vec : float, scalar or array-like

The vector to transform (shape (3,) or (3,N)), or x component (scalar or shape (N,)) if vy and vz are given

vy : float, scalar or array-like, optional

The y component of the vector (scalar or shape (N,))

vz : float, scalar or array-like, optional

The z component of the vector (scalar or shape (N,))

do_rot : bool, optional

if True, really perform the operation, if False do nothing.

Returns :

vec : float, array

The component of the rotated vector(s).