cap_distance¶
- pydl.pydlutils.mangle.cap_distance(x, cm, points)[source]¶
Compute the distance from a point to a cap, and also determine whether the point is inside or outside the cap.
- Parameters
- x
ndarray
orrecarray
X
value of the cap (3-vector).- cm
ndarray
orrecarray
CM
value of the cap.- points
ndarray
orrecarray
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.
- x
- Returns
ndarray
The distance(s) to the point(s) in degrees. If the distance is negative, the point is outside the cap.