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<title>pgcont</title>
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<h1><a name="label-0" id="label-0">Ruby/PGPLOT example: pgcont</a></h1><!-- RDLabel: "Ruby/PGPLOT example: pgcont" -->
<h3><a name="label-1" id="label-1">code</a></h3><!-- RDLabel: "code" -->
<pre>require "narray"
require "pgplot"
include Pgplot
# Preparing data
x = NArray.sfloat(40,1).indgen!(1)
y = NArray.sfloat(1,40).indgen!(1)
map = NMath.cos( NMath.sqrt(x*2)*0.3 - y*0.4/3 ) * NMath.cos( x*0.4/3 ) \
+ (x-y)/40
n = 21
level = NArray.sfloat(n).indgen! * (map.max-map.min)/n + map.min
# Draw contour map
pgopen
pgenv(1,40,1,40) # set "Plotter Environment" and draw box.
pgsci(3) # set Color Index to Green.
pgcont map, level</pre>
<h3><a name="label-2" id="label-2">output</a></h3><!-- RDLabel: "output" -->
<p><img src="pgcont.png" alt="pgcont.png"/></p>
<hr/>
<a href="./">Ruby/PGPLOT</a>
by Masahiro Tanaka
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