lm2index
This IDL routine provides a means to convert the alm degree and order
(l, m) into the index
i=l2 + l+ m + 1 (in order to be fed to
alm2fits routine for instance)
Location in HEALPix directory tree: ">src/idl/misc/lm2index.pro
FORMAT
IDL>
LM2INDEX,
l,
m,
index
QUALIFIERS
-
l
- Long array containing on INPUT the order l.
-
m
- Long array containing on INPUT the degree m.
-
index
- Long array containing on OUTPUT the index
i = l2 + l + m + 1.
DESCRIPTION
lm2index converts (l, m) into
i=l2 + l+ m + 1. Note that by
definition
(the routine does not check for this).
RELATED ROUTINES
This section lists the routines related to lm2index
-
idl
- version 6.4 or more is necessary to run lm2index.
-
fits2alm
- reads a FITS file containing
alm values.
-
alm2fits
- writes alm values into a FITS file.
-
index2lm
- routine complementary to lm2index:
converts i = l2 +
l + m + 1 into (l, m).
EXAMPLE:
will return in index in value
l2 + l+ m + 1
Version 3.30, 2015-10-08