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measures.doppler - Function

	Package	general
	Module	measures
	Tool	measures

define a doppler measure

Synopsis
doppler(rf, v0, off)

Arguments

rf	in	reference code
		Allowed:	coded string
v0	in	doppler ratio/velocity
		Allowed:	quantity
		Default:	0
off	in	optional offset
		Allowed:	doppler measure
		Default:	F

Returns
doppler measure

Description
doppler defines a doppler measure from the CLI. It has to specify a reference code, doppler quantity value (see introduction for the action on a scalar quantity with either a vector or scalar value, and when a vector of quantities is given), and optionally it can specify an offset, which in itself has to be a doppler. Allowable reference codes are: RADIO OPTICAL Z RATIO RELATIVISTIC BETA GAMMA.
Note that additional ones may become available. Check in Glish with:

   
- dm.listcodes(dm.doppler())   
[normal=RADIO Z RATIO BETA GAMMA OPTICAL TRUE RELATIVISTIC, extra=]

The doppler quantity values should be either non-dimensioned to specify a ratio of the light velocity, or in velocity. (examples all give same doppler):

Example

- dm.doppler('radio', 0.4)
[type=doppler, refer=radio, m0=[value=1.19917e+08, unit=m/s]] 
- dm.doppler('radio',dm.mul(dm.quantity(0.4),dm.constants('c')))
[type=doppler, refer=radio, m0=[unit=m/s, value=1.19917e+08]]