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<A HREF="toc.html">Contents</A>
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<HR NOSHADE>
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<H3><A NAME="8_1_3">8.1.3 Adding several plots to the same graph</A></H3>
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<P> What if we want to add a second plot to the graph we just produced?
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Well, this is quite straightforward and just requires two simple step:</P>
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<OL>
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<LI>Create the second plot</LI>
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<LI>Add it to the graph</LI>
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</OL>
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<P> To create the second plot we need some data (we could of course use
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the same data as for the first plot but then we wouldn't be able to see
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the new plot!)</P>
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<P> The following lines show how to create the new plot and add it to
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the graph (we only show the new lines - not the full script)<DIV class="phpscript">
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<CODE><FONT color="#000000"> <FONT color="#0000BB"> $ydata2 </FONT><FONT color="#007700">
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= array(</FONT><FONT color="#0000BB">1</FONT><FONT color="#007700">,</FONT><FONT
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color="#0000BB">19</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
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15</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">7</FONT><FONT
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color="#007700">,</FONT><FONT color="#0000BB">22</FONT><FONT color="#007700">
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,</FONT><FONT color="#0000BB">14</FONT><FONT color="#007700">,</FONT><FONT
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color="#0000BB">5</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
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9</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">21</FONT><FONT
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color="#007700">,</FONT><FONT color="#0000BB">13</FONT><FONT color="#007700">
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);
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<BR></FONT><FONT color="#0000BB">$lineplot2</FONT><FONT color="#007700">
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=new </FONT><FONT color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT
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color="#0000BB">$ydata2</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$lineplot2</FONT><FONT color="#007700">
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-></FONT><FONT color="#0000BB">SetColor</FONT><FONT color="#007700">(</FONT><FONT
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color="#DD0000">"orange"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$lineplot2</FONT><FONT color="#007700">
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-></FONT><FONT color="#0000BB">SetWeight</FONT><FONT color="#007700">(</FONT><FONT
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color="#0000BB">2</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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$lineplot2</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
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</FONT></CODE></DIV></P>
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<P> Making these changes to the previous graph script would generate a
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new graph as illustrated below.<DIV class="example">
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<BR> <A href="exframes/frame_example4.html" target="blank"><IMG border="0"
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HEIGHT="200" src="img/example4.png" WIDTH="300"></A>
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<BR><B>Figure 9:</B> Adding a second plot to the previous graph <A href="exframes/frame_example4.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P> There is a few things worth noting here</P>
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<UL>
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<LI>The Y-scale has changed to accommodate the larger range of Y-values
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for the second graph.</LI>
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<LI>If you add several plots to the same graph they should contain the
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same number of data points. This is not a requirement (the graph will
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be automatically scaled to accommodate the plot with the largest number
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of points) but it will not look very good since one of the plot end in
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the middle of the graph.</LI>
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</UL>
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<P></P>
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