Computes the alm of an Healpix map.
Parameters : | maps : array-like, shape (Npix,) or (n, Npix)
lmax : int, scalar, optional
mmax : int, scalar, optional
iter : int, scalar, optional
pol : bool, optional
use_weights: bool, scalar, optional :
regression: bool, scalar, optional :
datapath : None or str, optional
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Returns : | alms : array or tuple of array
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Notes
The pixels which have the special UNSEEN value are replaced by zeros before spherical harmonic transform. They are converted back to UNSEEN value, so that the input maps are not modified. Each map have its own, independent mask.