Gnuplot command Post: 302643321

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Top Forums Shell Programming and Scripting Gnuplot command Post 302643321 by programmerc on Saturday 19th of May 2012 04:46:51 AM

05-19-2012

Registered User

Gnuplot command

My data input looks like this:

Code:

-16.25 -38.75 9.69094
-16.25 -36.25 10.0594
-16.25 -33.75 10.3884
-16.25 -31.25 10.6653
-16.25 -28.75 10.7947
-16.25 -26.25 10.8838
-16.25 -23.75 10.8463
-16.25 -21.25 10.8131
-16.25 -18.75 10.7509
-16.25 -16.25 10.6581
-16.25 -13.75 10.6859
-16.25 -11.25 10.5997
-16.25 -8.75 10.6038
-16.25 -6.25 10.6944
-16.25 -3.75 10.6713
-16.25 -1.25 10.7106

-13.75 -178.75 19.6253
-13.75 -176.25 20.7997
-13.75 -173.75 22.1678
-13.75 -171.25 23.4394
-13.75 -168.75 24.4069
-13.75 -166.25 25.0053
-13.75 -163.75 25.2403
-13.75 -161.25 25.1125
-13.75 -158.75 24.6719
-13.75 -156.25 24.0381
-13.75 -153.75 23.2834
-13.75 -151.25 22.5541
-13.75 -148.75 21.8328
-13.75 -146.25 21.2981
-13.75 -143.75 20.7591
-13.75 -141.25 20.325
-13.75 -138.75 19.9369
-13.75 -136.25 19.4663
-13.75 -133.75 19.0484
-13.75 -131.25 18.5709
-13.75 -128.75 18.0059
-13.75 -126.25 17.4819
-13.75 -123.75 17.0388
-13.75 -121.25 16.6344
-13.75 -118.75 16.2572
-13.75 -116.25 15.6875
-13.75 -113.75 15.215
-13.75 -111.25 14.7719
-13.75 -108.75 14.2809
-13.75 -106.25 13.7406
-13.75 -103.75 13.3084
-13.75 -101.25 12.7847
-13.75 -98.75 12.3344
-13.75 -96.25 11.965

I am using splot, to produce a 3D graph as a function of two variables x, y.
I want to try to control the colour scale used by gnuplot, by modulating the value of the data in column three, $3 (the component being plotted).

I want to tell gnuplot that if

Code:

$3<20 then $3=$3 but if $3>20 then $3=20.

Any ideas?

In the terminal,

Code:

gnuplot
set pm3d
set view 0,0,1,2
set view equal xy #to make a square graph
splot "graph.dat" u 1:2:3 ($3<20:$3=$3:$3>20:$3=20) title "graph"

Last edited by programmerc; 05-19-2012 at 06:07 AM..

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ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)

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