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Gnuplot command

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Old 05-19-2012
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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