Groups > comp.graphics.apps.gnuplot > #2782

Fit 3D Line to data

Newsgroups	comp.graphics.apps.gnuplot
Date	2015-02-22 22:27 -0800
Message-ID	<68e9ed33-a7ef-4106-8730-151263df2011@googlegroups.com> (permalink)
Subject	Fit 3D Line to data
From	Erik Zweigle <erikzweigle@gmail.com>

Show all headers | View raw

Hello,

I am trying to fit a line to the 4 data points shown below.

377.4202, -345.5518, 2.1142
377.4201,	-345.5505, 2.5078
377.4206,	-345.556, 2.8359
377.4288, -345.5555, 3.2109

I only seem to be able to plot a plane with poor fitting.  Documentation doesn't mention parametric equation of line for 3D and it didn't work anyway.  Any pointers?

set datafile separator ","
set xlabel "X"
set ylabel "Y"
set zlabel "Z"

#set xrange [377.0:377.6]
#set yrange [-345.5:-346]
#set zrange [1.0:4.0]

f(x,y) = a*x + b*y + c

set title 'best fit trial'
fit f(x,y) 'data.csv' using 1:2:3 via a,b,c
splot 'data.csv' u 1:2:3 w p lt 3 ps 2, f(x,y)

Back to comp.graphics.apps.gnuplot | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Fit 3D Line to data Erik Zweigle <erikzweigle@gmail.com> - 2015-02-22 22:27 -0800
  Re: Fit 3D Line to data Karl <mail.kfr@gmx.net> - 2015-02-24 10:36 +0100
  Re: Fit 3D Line to data Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-02-24 20:16 +0100
    Re: Fit 3D Line to data Karl <mail.kfr@gmx.net> - 2015-02-25 14:34 +0100
      Re: Fit 3D Line to data Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-02-25 19:25 +0100
      Re: Fit 3D Line to data Axel Berger <Axel_Berger@B.Maus.De> - 2015-02-28 03:02 +0100
        Re: Fit 3D Line to data Erik Zweigle <erikzweigle@gmail.com> - 2015-02-28 12:47 -0800
        Re: Fit 3D Line to data Karl <mail.kfr@gmx.net> - 2015-03-01 06:46 +0100
  Re: Fit 3D Line to data Gavin Buxton <gavinbuxton@gmail.com> - 2015-02-25 06:28 -0800
    Re: Fit 3D Line to data Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-02-25 19:38 +0100

csiph-web