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Topic: lsqcurvefit: What to do against it?
Replies: 3   Last Post: Jan 15, 2013 8:51 AM

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Torsten Hennig

Posts: 2,419
Registered: 12/6/04
Re: lsqcurvefit: What to do against it?
Posted: Jan 15, 2013 8:51 AM
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> > Set TolFun to a smaller value.
> >
> > Best wishes
> > Torsten.

> Dear Torsten,
> that worked, but the fit is still pretty bad.
> I have a curve running from 10^0 down to 10^(-4) on
> the y axis.
> The first 10 data points are fitted well for low
> x-values, but badly for higher x-values.
> I wanted to fit the log of my function, but received
> after ca. 4h calculations times just four misfitted
> point from 299 data points.
> I received during fitting:
> Warning: Maximum function count exceeded; singularity
> likely.
> What do I do with it?
> Is there a chance to introduce with lsqcurvefit some
> error boundaries for the data or some weighing,
> please?

Can you supply the data points and the fitting function ?

Best wishes

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