alm_t2i
This IDL facility turns a tabular (real or complex) a(l,m) array into an
indexed list of alm that can be written into a FITS file with alm2fits
Location in HEALPix directory tree: src/idl/misc/alm_t2i.pro
FORMAT
QUALIFIERS
-
Alm_table
- Input real or complex array, containing all the for
in [0,
] and m in [0,
mmax]
(and s in [0,
smax] if applicable)
if REAL it has 3 (or 4) dimensions,
if COMPLEX is has 2 (or 3) dimensions
-
Index
- Output integer vector of size ni containing the index i of the
of coefficients, related to by
-
Alm_vec
- Output array of coefficients, with dimension (ni, 2 [,
smax+1])
where
ni = number of i indices
2 for real and imaginary parts of alm coefficients
smax+1 = number of signals (usually 1 for any of T E B
or 3 for T,E,B together)
KEYWORDS
-
HELP=
- if set, prints out the help header and exits
-
MFIRST=
- if set, the input array is a(m,l) instead of a(l,m)
DESCRIPTION
alm_t2i turns a real or complex tabular array of a(l,m) (or a(m,l) if
MFIRST is
set) into a real list of (with the real and imaginary parts separated)
and its index
. The unphysical elements of the input
table are dropped from the output list.
RELATED ROUTINES
This section lists the routines related to alm_t2i
-
idl
- version 6.4 or more is necessary to run alm_t2i.
-
alm_i2t
- this function is complementary to
alm_t2i and
turns an indexed list of alm (as generated by
fits2alm) into a tabular (real or complex) a(l,m) array
for easier manipulation
-
alm2fits, fits2alm
- routines to read and write indexed lists from and to FITS files.
EXAMPLE:
See alm_i2t example
Version 3.82, 2022-07-28