VCA_Distance¶

class turbustat.statistics.VCA_Distance(cube1, cube2, slice_size=1.0, breaks=None, fiducial_model=None)[source] [edit on github]¶

Bases: object

Calculate the distance between two cubes using VCA. The 1D power spectrum is modeled by a linear model. The distance is the t-statistic of the interaction between the two slopes.

Parameters:	cube1 : FITS hdu Data cube. cube2 : FITS hdu Data cube. slice_size : float, optional Slice to degrade the cube to. breaks : float, list or array, optional Specify where the break point is. If None, attempts to find using spline. If not specified, no break point will be used. fiducial_model : VCA Computed VCA object. use to avoid recomputing.

Methods Summary

Methods Documentation

distance_metric(labels=None, verbose=False)[source] [edit on github]¶

Implements the distance metric for 2 VCA transforms, each with the same channel width. We fit the linear portion of the transform to represent the powerlaw.

Parameters:	labels : list, optional Contains names of datacubes given in order. verbose : bool, optional Enables plotting.