Groups > comp.graphics.apps.gnuplot > #3485

linear fit of looped (and cutted) data set

Newsgroups	comp.graphics.apps.gnuplot
Date	2016-11-27 07:31 -0800
Message-ID	<4ad61db7-dd62-4b0f-8bb6-ffa3305505fb@googlegroups.com> (permalink)
Subject	linear fit of looped (and cutted) data set
From	Markus Grünwald <m_grueni@web.de>

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I've done measurements of cycling loads and saved into a text-file. Now i need to make a linear fit to these data points by only take care of a specific part of data points (limited y-range). - Hard to descirbe - therefore i tried to make a sketch of it: see http://ovh.to/2u45XF4

If i'll do this by setting a set of range during fit-command by using:
[code]
f(x) = k*x + d
fit [x_min:x_max] [y_min:y_max] f(x) "DATA.txt" using 2:3 via k,d
[/code]
i'll get a wrong fitting curve, because gnuplot seams to connect the dead ends of the cutted Data-set (seen in (1) of my sketch).

I think i will need a function that fits the linear function best to existing points ignoring the cutted dead ends (seen in (2) of my sketch).

Does anyone know a solution to get this behaviour?

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linear fit of looped (and cutted) data set Markus Grünwald <m_grueni@web.de> - 2016-11-27 07:31 -0800
  Re: linear fit of looped (and cutted) data set Ethan A Merritt <EAMerritt@gmail.com> - 2016-11-27 11:29 -0800
    Re: linear fit of looped (and cutted) data set Markus Grünwald <m_grueni@web.de> - 2016-11-27 14:56 -0800
      Re: linear fit of looped (and cutted) data set [solved] Markus Grünwald <m_grueni@web.de> - 2016-12-26 14:52 -0800
  Re: linear fit of looped (and cutted) data set Karl Ratzsch <mail.kfr@gmx.net> - 2016-11-27 22:11 +0100

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