healpy.sphtfunc.alm2map_der1

healpy.sphtfunc.alm2map_der1(alm, nside, lmax=None, mmax=None)

Computes an Healpix map and its first derivatives given the alm.

The alm are given as a complex array. You can specify lmax and mmax, or they will be computed from array size (assuming lmax==mmax).

Parameters:

alm : array, complex

A complex array of alm. Size must be of the form mmax(lmax-mmax+1)/2+lmax

nside : int

The nside of the output map.

lmax : None or int, optional

Explicitly define lmax (needed if mmax!=lmax)

mmax : None or int, optional

Explicitly define mmax (needed if mmax!=lmax)

Returns:

m, d_theta, d_phi : tuple of arrays

The maps correponding to alm, and its derivatives with respect to theta and phi. d_phi is already divided by sin(theta)