5.1.1.0 sd.average_time

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sd.average_time - Function

5.1.1 Averaging data in Time
Description

The function computes a weighted time average of a scantable or a list of scantables. The averaging is done in channel only. Supported weighting schemes are as follows:

none — no weighting
var — 1/var(spectrum) weighted
tsys — 1/Tsys**2 weighted
tint — integration time weighted
tintsys — Tint/Tsys**2 weighted
median — median averaging

Arguments


Inputs
	Input data as a scantable
	allowed:	scantable or a list of scantables
	Default:
mask	An optional mask (only used for ’var’ and ’tsys’ weighting)
	allowed:	bool list
	Default:	none
scanav	True averages each scan separately, False averages all scans together
	allowed:	bool
	Default:	False
weight	Weighting scheme (see description)
	allowed:	string
	Default:	’tint’
align	Align the spectra in velocity before averaging. It takes the time of the first spectrum in the first scantable as reference time.
	allowed:	bool
	Default:	False

Returns
scantable

Example

        scana = sd.scantable(’scana.asap’)
        scanb = sd.scantable(’scanb.asap’)
        # return a time averaged scan from scana and scanb
        # without using a mask
        scanav = sd.average_time(scana,scanb)
        # or equivalent
        scanav = sd.average_time([scana, scanb])
        # return the (time) averaged scan, i.e. the average of
        # all correlator cycles
        scanav = sd.average_time(scan, scanav=True)

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