ring_synthesis
call ring_synthesis( nsmax, nlmax, nmmax, datain, nph, dataout, kphi0 )
name & dimensionality | kind | in/out | description |
---|---|---|---|
nsmax | I4B | IN |
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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
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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.
Version 3.11, 2013-04-24