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measures.torestfrequency - Function

	Package	general
	Module	measures
	Tool	measures

convert a frequency and doppler measure to a rest frequency

Synopsis
torestfrequency(v0, d0)

Arguments

v0	in	frequency reference type
		Allowed:	string
d0	in	doppler value
		Allowed:	doppler measure

Returns
frequency measure

Description
torestfrequency will convert a frequency measure and a doppler measure (e.g. obtained from another spectral line with a known rest frequency) to a rest frequency.

Example

- print dp := dm.doppler('radio', '2196.24984km/s')  # a measured doppler speed 
[type=doppler, refer=radio, m0=[value=2196249.84, unit=m/s]]
- print f := dm.frequency('lsrk','1410MHz')    # a measured frequency
[type=frequency, refer=lsrk, m0=[value=1.41e+09, unit=Hz]]
- dm.torestfrequency(f, dp)                   # the corresponding rest frequency
[type=frequency, refer=REST, m0=[value=1.42040575e+09, unit=Hz]]