galpy.df.streamdf.sigangledAngle

streamdf.sigangledAngle(dangle, assumeZeroMean=True, smallest=False, simple=False)[source]

NAME:

sigangledAngle

PURPOSE:

calculate the dispersion in the perpendicular angle at a given angle

INPUT:

dangle - angle offset along the stream

assumeZeroMean= (True) if True, assume that the mean is zero (should be)

smallest= (False) calculate for smallest eigenvalue direction rather than for middle

simple= (False), if True, return an even simpler estimate

OUTPUT:

dispersion in the perpendicular angle at this angle

HISTORY:

2013-12-06 - Written - Bovy (IAS)