circle_cap

pydl.pydlutils.mangle.circle_cap(radius, points)

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.