alm_i2t
This IDL function turns an indexed list of alm (as generated by
fits2alm) into a tabular (real or complex) a(l,m) array for easier manipulation
Location in HEALPix directory tree: src/idl/misc/alm_i2t.pro
FORMAT
QUALIFIERS

Index
 Integer vector of size ni containing the index i of the
of a_{lm} coefficients, related to {l,m} by
i = l^{2} + l + m + 1

Alm_vec
 Array of a_{lm} coefficients, with dimension (ni, nalm [,nsig])
where
ni = number of i indices
nalm = 2 for real and imaginary parts of alm coefficients or
4 for above plus corresponding error values
nsig = number of signals (usually 1 for any of T E B
or 3 for T,E,B together)
KEYWORDS

/COMPLEX
 if set, the output array is complex with dimensions
(lmax+1, mmax+1, [nalm/2 , nsig]),
otherwise, the array is real with dimensions
(lmax+1, mmax+1, nalm [, nsig]).
lmax and mmax are determined from input Index values, unless set otherwise
by user.

/HELP
 if set, prints out the help header and exits

LMAX=
 lmax to be used in output array, regardless of
value found in input index

MMAX=
 mmax to be used in output array, regardless of
value found in input index
DESCRIPTION
alm_i2t returns a real or complex array, containing the a_{lm} with
and
. The negative m are
therefore ignored.
RELATED ROUTINES
This section lists the routines related to alm_i2t

idl
 version 6.4 or more is necessary to run alm_i2t.

alm_t2i
 turns tabular alm's such as those generated by
alm_i2t into indexed lists than can written to FITS files with
alm2fits

alm2fits, fits2alm
 routines to read and write a_{lm} indexed lists from and to FITS files.
EXAMPLE:
Version 3.31, 20170106