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<title>ploticus: legend-driven technique</title>
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<td><br><h2>Legend-driven technique</h2></td>
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<title>Manual page for Legend-driven_technique(PL)</title>
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<p>
"Legend-driven technique" allows
bar color, scatterplot symbol, etc. to be controlled by a data field.<tt> </tt>
This technique involves defining a legend <i>first</i>, containing information
to associate data field contents with appearance details.<tt> </tt>
Then the plotting is done.<tt> </tt>
<p>
Here is the procedure:
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<dt><dd><p>
1. For every expected variation (bar color, scatterplot symbol, or whatever)
set up an explicit legend entry using
<a href="legendentry.html">
proc legendentry
</a>
. Label, tag, and details attributes should be supplied.<tt> </tt>
The tag will be compared with data field contents.<tt> </tt>
The details attributes control appearance.<tt> </tt>
<dt><dd><p>
2. Plot, using the appropriate attribute. For example, if you are
doing a bar graph where individual bar colors are controlled by a data
field, you would use <b>proc bars</b> and specify a <tt>colorfield</tt>.<tt> </tt>
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<a href="Welcome.html">
<img src="../doc/ploticus.gif" border=0></a><br><small>data display engine <br>
<a href="../doc/Copyright.html">Copyright Steve Grubb</a>
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