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Re: problem with leasqr fitting


From: Olaf Till
Subject: Re: problem with leasqr fitting
Date: Tue, 30 Mar 2021 17:49:26 +0200
User-agent: Mutt/1.10.1 (2018-07-13)

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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