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measures.tofrequency - Function

	Package	general
	Module	measures
	Tool	measures

convert a doppler type value to a frequency

Synopsis
tofrequency(rf, v0, rfq)

Arguments

rf	in	frequency reference type
		Allowed:	string
v0	in	doppler value
		Allowed:	doppler measure
rfq	in	rest frequency
		Allowed:	frequency measure or frequency quantity

Returns
frequency measure

Description
tofrequency will convert a Doppler type value (e.g. in radio mode) to a frequency. The type of frequency (e.g. LSRK) and a rest frequency (either as a frequency quantity (e.g. dm.constants('HI')) or a frequency measure (e.g. dm.frequency('rest','5100MHz')) should be specified

Example

- print a := dm.doppler('radio',0.4)
[type=doppler, refer=radio, m0=[unit=m/s, value=1.19917e+08]]
- dm.tofrequency('lsrk',a,dm.constants('HI'))
[type=frequency, refer=LSRK, m0=[unit=Hz, value=8.52243e+08]]