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imagepol.sigmalinpolint - Function

	Package	general
	Module	images
	Tool	imagepol

Error in linearly polarized intensity

Synopsis
sigmalinpolint(clip, sigma, outfile)

Arguments

clip	in	Clip level for auto-sigma determination
		Allowed:	Float
		Default:	10
sigma	in	Standard deviation of thermal noise
		Allowed:	Float
		Default:	Auto determined
outfile	in	Output image file name
		Allowed:	String
		Default:	Unset

Returns
Float or fail

Description

This function (short-hand name slpi) returns the error (standard deviation) of the linearly polarized intensity; $\sqrt{(Q^2+U^2)}$. This result comes from standard propagation of statistical errors. The result is a float as the error is not signal-to-noise ratio dependent

This function requires the standard deviation of the thermal noise. You can either supply it if you know it, or it will be worked out for you with outliers from the mean clipped at the specified level.

Example

- p := imagepol('stokes.cube')
- siglpi := p.sigmalinpolint()