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<h1>Plotting</h1>
<p>DPUSER incorporates the complete <a href="http://astro.caltech.edu/~tjp/pgplot/" target="_top">PGPLOT</a>
package. All modules of this package are realized as procedures (<a href="pgplot.html">see
list of available PGPLOT procedures</a>). The PGPLOT documentation provided
here is a verbatim copy of the online documentation of PGPLOT.
<br>DPUSER uses a global variable
<tt>plotdevice</tt> to control graphics
output. Available devices depend on your installation of PGPLOT. The default
graphics device on UNIX workstations is <tt>"/xserve"</tt>. This can be
changed by assigning a new string value to the variable. A typical use
of PGPLOT looks like this:
<blockquote><tt>plotdevice = "/tmp/test.eps/ps"
// Write ps output to /tmp/test.eps</tt>
<br><tt>x = [-3600:3600]/10
// create x-axes</tt>
<br><tt>y = sin(x, /deg)
// create sine function (y-axes)</tt>
<br><tt>pgopen plotdevice
// Start plotting</tt>
<br><tt>pgenv -360, 360, -1, 1, 0, 0
// draw labeled frame</tt>
<br><tt>pglab "angle", "sine", "test plot" // annotate plot</tt>
<br><tt>pgline 7201, x, y
// draw the sine function</tt>
<br><tt>pgend
// end plotting</tt>
<br><tt>plotdevice = "/xserve"
// reset graph output to X</tt></blockquote>
Since plotting a x-y graph is, amongs others, a very common task, DPUSER
provides several convenience procedures to do things like this: <a href="procedure_plot.html">plot</a>,
<a href="procedure_contour.html">contour</a>,
<a href="procedure_surface.html">surface</a>,
and <a href="procedure_shade.html">shade</a>. The above example using
the plot command looks like this:
<blockquote><tt>plotdevice = "/tmp/test.eps/ps"
// Write ps output to /tmp/test.eps</tt>
<br><tt>x = [-3600:3600]/10
// create x-axes</tt>
<br><tt>y = sin(x, /deg)
// create sine function (y-axes)</tt>
<br><tt>plot x, y, xtitle="angle", ytitle="sine", title="test plot"</tt>
<br><tt>
// do the plot</tt>
<br><tt>plotdevice = "/xserve"
// reset graph output to X</tt></blockquote>
This can be done even shorter:
<blockquote><tt>plot sin([-3600:3600]/10)</tt></blockquote>
will plot a sine function without any annotation to the current plot device,
overriding any previous plot. A very simple contour plot can also be done:
<blockquote><tt>contour gauss(129,129,30,50,30), [1:9]*10</tt></blockquote>
will do a contour plot of an elliptical gaussian with contour levels 10%,
20%, ..., 90%.
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Copyright © Thomas Ott ---- DPUSER - The Next Generation 3.3 (Rev. )
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