yilmindexvector.doc

Compute the index of a 1D array of spherical harmonic coefficients
corresponding to i, l, and m.

Usage
-----
index = YilmIndexVector (i, l, m)

Returns
-------
index : integer
    Index of a 1D array of spherical harmonic coefficients corresponding
    to i, l, and m.

Parameters
----------
i : integer
    1 corresponds to the cosine coefficient Ylm = cilm[0,:,:], and 2
    corresponds to the sine coefficient Yl,-m = cilm[1,:,:].

l : integer
    The spherical harmonic degree.
m : integer
    The angular order, which must be greater or equal to zero.

Notes
-----
YilmIndexVector will calculate the index of a 1D vector of spherical
harmonic coefficients corresponding to degree l, (positive) angular order
m and i (1 = cosine, 2 = sine). The index is given by l**2+(i-1)*l+m.