Up: ANALYSE Language Internal Help
SMOOTH copies R into T, then degrades the frequency/velocity resolution
of R. The arguments are used to specify the method :
- HANNING (default)
The new spectrum has twice less channels and twice less resolution.
Uses a cross-validation smoothing with automatic choice of smoothing
parameter. To be used with caution. Noise in adjacent channels must
be independant, otherwise the algorithm flatly refuses to do any
smoothing at all (but needs a long computing time to realise
- GAUSS Width
Convolves (by multiplication in the Fourier plane) by a gaussian of
specified width in current units.
- BOX Ncan
Averages Ncan adjacent channels to produce a spectrum with Ncan less
resolution and channels.
- NOISE Flux Nc
For each channel, sums at most Nc neighbouring channels until a to-
tal flux Flux is reached in the sum. Then attributes the average
value (sum divided by number of channels added) to the channel. This
smoothing is non-uniform, strictly positive, and has an obvious ten-
dency to produce wings...