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fitter.covariance - Function

	Package	utility
	Module	fitting
	Tool	fitter

get the covariance matrix

Synopsis
covariance(id)

Arguments

id	in	the id of a sub-tool
		Allowed:	fitter id
		Default:	0

Returns
n x n matrix

Description
Obtain the covariance matrix of a fit

Example

- include 'fitting.g'
- fit := fitter(n=1);		# a fitter for one real unknown
- fit.linear(dfs.functional('hyper',1),1+0*1:6, 1:6)
			# equations are x=1; x=2; ... x=6 
T
- fit.covariance()
0.166667