xpipe.xhandle.xwrap.CatRotator

class xpipe.xhandle.xwrap.CatRotator(fname, seed=5, e_inds=(3, 4))

Loads shear catalog, and saves a randomly rotated version

Parameters

• fname (str) – path to the shear catalog (ascii format)

• seed (int) – random seed for rotation

• e_inds (list) – inxed for :c;Pode:e1 and e2 column of the shear catalog

Notes

Steps:

• read catalog from ascii file

• rotate catalog based on random seed

• write catalog to file. The output file name is defined by the prefix: rot_seed' + str(self.seed) + '_'

The rotated catalog file is later deleted after the calculations finished

get_oname()

get output name

readcat()

read shear catalog

rmcat()

delete shear catalog

rotate()

Perform a random rotation on the shear catalog

writecat()

write rotated shear catalog