Groups > comp.graphics.apps.gnuplot > #3498

Re: linear fit of looped (and cutted) data set [solved]

Newsgroups	comp.graphics.apps.gnuplot
Date	2016-12-26 14:52 -0800
References	<4ad61db7-dd62-4b0f-8bb6-ffa3305505fb@googlegroups.com> <o1fc4s$bo2$1@dont-email.me> <aa2bf3fc-6c30-42a9-ab4b-d04c2dece171@googlegroups.com>
Message-ID	<1321e4bf-c117-4ed3-b2a7-317fd0577e10@googlegroups.com> (permalink)
Subject	Re: linear fit of looped (and cutted) data set [solved]
From	Markus Grünwald <m_grueni@web.de>

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After a bunch of trial and error I've found a better solution (fits now as i expected it should do):

Due to the fact that i limited the ordinates (and not abscissa as expected by gnuplot - and also gnumeric, what I've tried too) I've got this strange results. So i just switched the axis and did a fit on yx-pairs of data:

[code]
f(x) = (x - d) / k
fit [ymin:ymax] [xmin:xmax] f(x) "Data.txt" using 3:2 via k,d
f(x) = k*x + d
[/code]

now it works perfectly.

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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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