plancklens.filt_util

CMB filtering utilities module.

This module collects some convenience wrapper libraries.

class filt_util.library_ftl(ivfs, lmax, lfilt_t, lfilt_e, lfilt_b)

Library of a-posteriori re-scaled filtered CMB maps, for separate temperature and polarization filtering

Parameters:

• ivfs – inverse filtering library instance (e.g. one of those in plancklens.filt.filt_simple).

• lmax (int) – defines the new healpy alm array shape (identical for temperature and polarization)

• lfilt_t (1d array) – filtered temperature alms are rescaled by lfilt_t

• lfilt_e (1d array) – filtered E-polarization alms are rescaled by lfilt_e

• lfilt_b (1d array) – filtered B-polarization alms are rescaled by lfilt_b

Wraps the input filtering instance (ivfs) methods to keep the same interface.

Note

ftl fel fbl should eventually be taken off to be replaced by fal in all cases

class filt_util.library_shuffle(ivfs, idxs)

A library of filtered sims with remapped indices.

This is useful for lensing biases calculations, such as \(\hat N^{(0)}_L.\)

Parameters:

• ivfs – inverse-variance filtering library instance.

• idxs – index idx of this new instance points to idxs[idx] of the input ivfs instance.

Wraps the input filtering instance (ivfs) methods to keep the same interface.