Re: problem with leasqr fitting

Olaf Till <[email protected]> Tue, 30 Mar 2021 17:49:26 +0200

Newsgroups	gmane.comp.gnu.octave.general
Message-ID	<20210330154926.GB4405@till>

On Tue, Mar 23, 2021 at 06:41:57AM -0500, mrodrig via Help-octave wrote:
> Thanks for the reply. I am interested in the values of corp1 and covp1 since
> with them I estimate the errors in the determination of certain points of
> the curve (tmaxi, imaxi, eacti1). ¿any idea?

Contrary to leasqr, the combination of nonlin_residmin and
residmin_stat (or nonlin_curvefit and curvefit_stat) is able to
compute some elements of the covariance or correlation matrices of the
parameters even if not all elements are computable. See optim_doc().

(By default, nonlin_residmin/nonlin_curvefit use the same optimization
algortithm as leasqr.)

Olaf

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