|
ring_synthesis
Location in HEALPix directory tree:
src/f90/mod/alm_tools.f90
FORMAT call ring_synthesis(
nsmax, nlmax, nmmax, datain, nph, dataout, kphi0
)
ARGUMENTS
| name & dimensionality |
kind |
in/out |
description |
|---|
| |
|
|
|
|
nsmax |
I4B |
IN |
 of the map. |
| nlmax |
I4B |
IN |
Maximum l of the analysis. |
| nmmax |
I4B |
IN |
Maximum m of the analysis. |
| nph |
I4B |
IN |
The number of points on the ring. |
| datain(0:nmmax) |
DPC |
IN |
Fourier components as computed from the alm. |
| dataout(0:nph-1) |
DP |
OUT |
Synthesized function values on the ring. |
| kphi0 |
I4B |
IN |
0 if the first pixel on the ring is at
 ; 1 otherwise. |
EXAMPLE:
call ring_synthesis(64,128,128,datain,8,dataout,1)
This computes the inverse (complex-to-real) Fast Fourier Transform for
the second ring from the pole, containing 8 pixels, for a map
resolution of
 . 128 complex Fourier
compoments contribute to these 8 pixels. The value kphi0=1 specifies
that a phase factor needed to be applied to correctly
rotate the ring into position on the HEALPix grid.
MODULES & ROUTINESThis section lists the modules and routines used by ring_synthesis.
-
healpix_fft
- module.
RELATED ROUTINESThis section lists the routines related to ring_synthesis
-
ring_analysis
- Forward transform, used in
map2alm and anafast
Eric Hivon
2010-06-18
|
|
