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| From | Ingo Thies <ingo.thies@gmx.de> |
| Newsgroups | comp.graphics.apps.gnuplot |
| Subject | Re: Wrong fit direction / zrange / unreadable graph file |
| Date | Thu, 19 May 2011 10:58:12 +0200 |
| Lines | 24 |
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On 19.05.2011 01:39, Hans-Bernhard Bröker wrote:
> gnuplot's fit model isn't linear, though. I.e. "fit" doesn't assume,
> nor does it know, whether the model function is a straight line. As far
> as gnuplot is concerned, the model is an arbitrarily complicated
> function of one variable and two parameters.
Gnuplot doesn't have to assume that a linear function is to be fitted
since the user already provides its form:
f(x)=a+b*x
fit [rangeinfo] f(x) via a,b
So, no reason for f(x) to behave in a strange way for a=0, or to assume
anything else then exactly the type of function the user is requesting
for. And, as mentioned, there are standard Levenberg-Marquardt
algorithms which do not stumble over that. Therefore, I would guess,
that the problem is caused by the implementation into gnuplot rather
than by the method itself.
--
Gruß,
Ingo
Back to comp.graphics.apps.gnuplot | Previous | Next — Previous in thread | Find similar
Wrong fit direction / zrange / unreadable graph file Katharina Miwege <k.miwege@googlemail.com> - 2011-05-15 23:59 -0700
Re: Wrong fit direction / zrange / unreadable graph file Christoph Bersch <usenet@bersch.net> - 2011-05-16 11:04 +0200
Re: Wrong fit direction / zrange / unreadable graph file Ingo Thies <ingo.thies@gmx.de> - 2011-05-16 11:34 +0200
Re: Wrong fit direction / zrange / unreadable graph file Christoph Bersch <usenet@bersch.net> - 2011-05-16 11:52 +0200
Re: Wrong fit direction / zrange / unreadable graph file Richard Owlett <rowlett@pcnetinc.com> - 2011-05-16 06:25 -0500
Re: Wrong fit direction / zrange / unreadable graph file Christoph Bersch <usenet@bersch.net> - 2011-05-16 14:44 +0200
Re: Wrong fit direction / zrange / unreadable graph file Ingo Thies <ingo.thies@gmx.de> - 2011-05-16 16:31 +0200
Re: Wrong fit direction / zrange / unreadable graph file Katharina Miwege <k.miwege@googlemail.com> - 2011-05-16 09:01 -0700
Re: Wrong fit direction / zrange / unreadable graph file Christoph Bersch <usenet@bersch.net> - 2011-05-17 08:46 +0200
Re: Wrong fit direction / zrange / unreadable graph file Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-05-19 01:34 +0200
Re: Wrong fit direction / zrange / unreadable graph file Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-05-19 01:49 +0200
Re: Wrong fit direction / zrange / unreadable graph file Ingo Thies <ingo.thies@gmx.de> - 2011-05-19 11:07 +0200
Re: Wrong fit direction / zrange / unreadable graph file Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-05-19 14:02 +0200
Re: Wrong fit direction / zrange / unreadable graph file Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-05-19 01:39 +0200
Re: Wrong fit direction / zrange / unreadable graph file Ingo Thies <ingo.thies@gmx.de> - 2011-05-19 10:58 +0200
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