positionRms¶
-
lsst.validate.drp.util.
positionRms
(ra_mean, dec_mean, ra, dec)¶ Calculate the RMS between an array of coordinates and a reference (mean) position.
Parameters: - ra_mean :
float
Mean RA in radians.
- dec_mean :
float
Mean Dec in radians.
- ra :
numpy.array
[float
] Array of RA in radians.
- dec :
numpy.array
[float
] Array of Dec in radians.
Returns: - pos_rms :
float
RMS scatter of positions in milliarcseconds.
Notes
The RMS of a single-element array will be returned as 0. The RMS of an empty array will be returned as NaN.
- ra_mean :