circle_cap¶
-
pydl.pydlutils.mangle.
circle_cap
(radius, points)[source]¶ Construct caps based on input points (directions on the unit sphere).
Parameters: Radii of the caps in degrees. This will become the
CM
value.If
points
is a 3-vector, or set of 3-vectors, then assume the point is a Cartesian unit vector. Ifpoint
is a 2-vector or set of 2-vectors, assume the point is RA, Dec.Returns: A tuple containing
X
andCM
values for the cap.