medianEllipticity2ResidualsFromCat

lsst.validate.drp.util.medianEllipticity2ResidualsFromCat(cat)

Compute the median imaginary ellipticty residuals from a catalog of measurements.

Parameters:

cat : collection

Object with .get method for ‘e2’, ‘psf_e2’ that returns radians.

Returns:

e2_median : float

Median imaginary ellipticity residual.