circle_cap

pydl.pydlutils.mangle.circle_cap(radius, points)[source]

Construct caps based on input points (directions on the unit sphere).

Parameters
radiusfloat or ndarray

Radii of the caps in degrees. This will become the CM value.

pointsndarray or recarray

If points is a 3-vector, or set of 3-vectors, then assume the point is a Cartesian unit vector. If point is a 2-vector or set of 2-vectors, assume the point is RA, Dec.

Returns
tuple

A tuple containing X and CM values for the cap.