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Groups > comp.graphics.apps.gnuplot > #324

Re: Multible Fits using the same fit function lead to ?false? results.

From Hans-Bernhard Bröker <HBBroeker@t-online.de>
Newsgroups comp.graphics.apps.gnuplot
Subject Re: Multible Fits using the same fit function lead to ?false? results.
Date 2011-05-19 01:56 +0200
Message-ID <93j4l3F5euU1@mid.dfncis.de> (permalink)
References <836a279c-e42c-4304-a7a5-6dfd90ebe7df@hd10g2000vbb.googlegroups.com>

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On 18.05.2011 00:04, Oliver Götze wrote:
> Hi
> i just noticed that using a gnuplot script like this:
[...]
> on a table.dat file like this (just an example):
[...]
> leads to false results,

It's really hard to help you based on such a vague description.  What 
exactly do you think is "wrong" about those results?

> i have to reset (or set to zero) die
> coefficients a0, a1, a2 after/before every fit by placing
> a0=0
> a1=0
> a2=0

Don't do that.  Fit parameters should never be zero; particularly not 
the start-up values.

> If i do not do this the last values for the coefficients are taken
> into the next fit and this is influencing the results.

So what?

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Thread

Multible Fits using the same fit function lead to ?false? results. Oliver Götze <goetze.oliver@googlemail.com> - 2011-05-17 15:04 -0700
  Re: Multible Fits using the same fit function lead to ?false? results. Christoph Bersch <usenet@bersch.net> - 2011-05-18 09:54 +0200
  Re: Multible Fits using the same fit function lead to ?false? results. Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-05-19 01:56 +0200

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