polyfit: add the ability to specify the polynomial template

[CdeMills]

Hello,

I enclose a patch against the stable branch polyfit.m in order to specify
the polynomial template, i.e. giving the ability to force some of the
coefficients to be zero. This is accomplished by passing a logical vector
instead of a scalar for the last argument. Also compute C, the inverse of
r.'*r, which is the unscaled covariance matrix. To obtain the standard
deviation, simply take sqrt(diag(C)/df)*normr; where df are the degrees of
freedom and normr the residual norm.

Changelog entry:

polyfit.m: add the ability to specify polynomial template


Regards

Pascal

http://octave.1599824.n4.nabble.com/file/n4357144/polyfit.pat polyfit.pat 

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