cap_distance

pydl.pydlutils.mangle.cap_distance(x, cm, points)

Compute the distance from a point to a cap, and also determine whether the point is inside or outside the cap.

Parameters:

x : ndarray or recarray

X value of the cap (3-vector).

cm : ndarray or recarray

CM value of the cap.

points : ndarray 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:

ndarray

The distance(s) to the point(s) in degrees. If the distance is negative, the point is outside the cap.