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Workspace Method WMRFSelectChannels

Description

Select some channels for WMRF calculation.

The HIRS fast setup consists of a precalculated frequency grid
covering all HIRS channels, and associated weights for each channel,
stored in a weight matrix. (A sensor_response matrix.)

If not all channels are requested for
simulation, then this method can be used to remove the unwanted
channels. It changes a number of variables in consistent fashion:

- Unwanted channels are removed from f_backend. 
- Unwanted channels are removed from wmrf_weights.
- Unnecessary frequencies are removed from f_grid.
- Unnecessary frequencies are removed from wmrf_weights.

Authors: Stefan Buehler

Synopsis

WMRFSelectChannels(

f_grid, wmrf_weights, f_backend, wmrf_channels )

Variables

OUT	f_grid	(Vector)	The frequency grid for monochromatic pencil beam calculations.
OUT	wmrf_weights	(Sparse)	The weights for a WMRF fast calculation.
OUT	f_backend	(Vector)	The frequency position of each backend (spectrometer) channel.
IN	f_grid	(Vector)	The frequency grid for monochromatic pencil beam calculations.
IN	f_backend	(Vector)	The frequency position of each backend (spectrometer) channel.
IN	wmrf_weights	(Sparse)	The weights for a WMRF fast calculation.
IN	wmrf_channels	(ArrayOfIndex)	Channel selection for WMRF fast calculation.