This IDL facility provides an interface to F90 'smoothing' facility

Location in HEALPix directory tree: src/idl/interfaces/ismoothing.pro

FORMAT

IDL> ISMOOTHING, map1_in, map_out [, beam_file=, binpath=, double=, fwhm_arcmin=, help=, iter_order=, keep_tmp_files=, lmax=, nlmax=, nested=, ordering=, plmfile=, regression=, ring=, simul_type=, silent=, theta_cut_deg=, tmpdir=, won=, w8file=, w8dir=]

QUALIFIERS

map1_in: required input: input map, can be a FITS file, or a memory array containing the map to smooth
map2_out: required output: output smoothed map, can be a FITS file, or a memory array

KEYWORDS

beam_file=: beam window function, either a FITS file or an array
binpath=: full path to back-end routine default:$HEXE/smoothing, then $HEALPIX/bin/smoothing
- a binpath starting with / (or $\backslash$ ), or $ is interpreted as absolute
- a binpath starting with ./ is interpreted as relative to current directory
- all other binpathes are relative to $HEALPIX
/double: if set, I/O is done in double precision default:single precision I/O
fwhm_arcmin=: gaussian beam FWHM in arcmin default:0
/help: if set, prints extended help
iter_order=: order of iteration in the analysis default:0
/keep_tmp_files: if set, temporary files are not discarded at the end of the run
lmax=, nlmax=: maximum multipole of smoothing default:determined by back-end routine (ie, smoothing)
/nested: if set, signals that *all* maps and mask read online are in NESTED scheme (does not apply to FITS file), see also /ring and Ordering
ordering=: either 'RING' or 'NESTED', ordering of online maps and masks, see /ring and Ordering
plmfile=: FITS file containing precomputed Spherical Harmonics default:no file
regression=: 0, 1 or 2, regress out best fit monopole and/or dipole before alm analysis default:0, analyze raw map
/ring: see /nested and Ordering above
simul_type=: 1 or 2, analyze temperature only or temperature + polarization
/silent: if set, works silently
theta_cut_deg=: cut around the equatorial plane
tmpdir=: directory in which are written temporary files default:IDL_TMPDIR (see IDL documentation)
/won: if set, a weighting scheme is used to improve the quadrature default:apply weighting
w8file=: FITS file containing weights default:determined automatically by back-end routine. Do not set this keyword unless you really know what you are doing
w8dir=: directory where the weights are to be found default:determined automatically by back-end routine

DESCRIPTION

ismoothing is an interface to 'smoothing' F90 facility. It requires some disk space on which to write the parameter file and the other temporary files. Most data can be provided/generated as an external FITS file, or as a memory array.

RELATED ROUTINES

This section lists the routines related to ismoothing

idl: version 6.1 or more is necessary to run ismoothing.
smoothing: F90 facility called by ismoothing.
ianafast: IDL Interface to F90 anafast and C++ anafast_cxx
isynfast: IDL Interface to F90 synfast

EXAMPLE:

whitenoise = randomn(seed, nside2npix(256))

ismoothing, whitenoise, rednoise, fwhm=120, /ring, simul=1,/silent

mollview, whitenoise,title='White noise'

mollview, rednoise, title='Smoothed white Noise'

will generate and plot a white noise map and its smoothed version

Eric Hivon 2010-06-18

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