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A function that rotates TEB 2D power spectra to TQU spectra and back #40

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A function that rotates TEB 2D power spectra to TQU spectra and back #40

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91b5484
new function rotate_pol_power
msyriac Apr 22, 2018
3e98eed
removed module self reference
msyriac Apr 22, 2018
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14 changes: 14 additions & 0 deletions enmap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -637,6 +637,20 @@ def rotate_pol(emap, angle, comps=[-2,-1]):
res[...,comps[1],:,:] = s*emap[...,comps[0],:,:] + c*emap[...,comps[1],:,:]
return res

def rotate_pol_power(shape,wcs,cov,iau=False,inverse=False):
"""Rotate a 2D power spectrum from TQU to TEB (inverse=False) or
back (inverse=True). cov is a (3,3,Ny,Nx) 2D power spectrum.
"""
rot = np.zeros((3,3,cov.shape[-2],cov.shape[-1]))
rot[0,0,:,:] = 1
prot = queb_rotmat(lmap(shape,wcs), inverse=inverse, iau=iau)
rot[1:,1:,:,:] = prot
Rt = np.transpose(rot, (1,0,2,3))
tmp = np.einsum("ab...,bc...->ac...",rot,cov)
rp2d = np.einsum("ab...,bc...->ac...",tmp,Rt)
return rp2d


def map_mul(mat, vec):
"""Elementwise matrix multiplication mat*vec. Result will have
the same shape as vec. Multiplication happens along the first indices.
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