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Groups > comp.graphics.apps.gnuplot > #3657
| From | Karl Ratzsch <mail.kfr@gmx.net> |
|---|---|
| Newsgroups | comp.graphics.apps.gnuplot |
| Subject | Re: What's new in gnuplot 5.2 |
| Date | 2017-06-02 10:18 +0200 |
| Organization | solani.org |
| Message-ID | <ogr70t$1b2$1@solani.org> (permalink) |
| References | <ac6rb8.ur8.19.1@isomedia.com> <b30f5dfe-333f-4a47-b61e-ab6e6b0a96fc@googlegroups.com> |
Am 01.06.2017 um 08:16 schrieb hugocoolens@gmail.com: > Is it possible to put in an easy way constraints on the fitting parameters in this version of Gnuplot? I've always missed something like being able to put in "0<a<10" for a function fit with a as a parameter? Unfortunately not, but for some good reason. It's not a simple thing to add constraints to the Marquardt-Levenberg algorithm, because it's not clear (and probably very problem-dependent) what should happen when the parameter approaches that limit. You probably know the feature from "OriginPro", and most people i know agree that it messes up their fitting routines quite a bit. Most often when one parameter wants to diverge, that is because the given function does not really describe the data or the starting values are bad. Trying to predetermine them by fitting only certain parts of your data using simplified functions is usually helpful. Karl
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What's new in gnuplot 5.2 Raoul Fleckman <raoul.fleckman@gmail.com> - 2017-05-26 21:13 +0000
Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-05-31 23:16 -0700
Re: What's new in gnuplot 5.2 Karl Ratzsch <mail.kfr@gmx.net> - 2017-06-02 10:18 +0200
Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-02 02:32 -0700
Re: What's new in gnuplot 5.2 Karl Ratzsch <mail.kfr@gmx.net> - 2017-06-02 12:11 +0200
Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-03 12:49 -0700
Re: What's new in gnuplot 5.2 Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-06-03 22:45 +0200
Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-05 01:32 -0700
Re: What's new in gnuplot 5.2 Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-06-05 14:47 +0200
Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-06 23:34 -0700
Re: What's new in gnuplot 5.2 Dr Engelbert Buxbaum <engelbert_buxbaum@hotmail.com> - 2017-06-07 14:26 +0200
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