imagepol.sigma - Function

Find best guess at thermal noise

Synopsis
sigma(clip)

Arguments

clip	in	Clip level for auto-sigma determination
		Allowed:	Float
		Default:	10

Returns
Float or fail

Description

This function returns the standard deviation from V, Q&U or I in that order of precedence. It is attempting to give you the best estimate of the thermal noise it can from the data. Outliers from the mean are clipped at the specified level.

Example

- p := imagepol('stokes.cube')
- sigma := p.sigma()

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	Package	general
	Module	images
	Tool	imagepol