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  28  <H3><A NAME="8_1_3">8.1.3 Adding several plots to the same graph</A></H3>
  29  <P> What if we want to add a second plot to the graph we just produced?
  30   Well, this is quite straightforward and just requires two simple step:</P>
  31  <OL>
  32  <LI>Create the second plot</LI>
  33  <LI>Add it to the graph</LI>
  34  </OL>
  35  <P> To create the second plot we need some data (we could of course use
  36   the same data as for the first plot but then we wouldn't be able to see
  37   the new plot!)</P>
  38  <P> The following lines show how to create the new plot and add it to
  39   the graph (we only show the new lines - not the full script)<DIV class="phpscript">
  40  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$ydata2&nbsp;</FONT><FONT color="#007700">
  41  =&nbsp;array(</FONT><FONT color="#0000BB">1</FONT><FONT color="#007700">,</FONT><FONT
  42  color="#0000BB">19</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
  43  15</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">7</FONT><FONT
  44  color="#007700">,</FONT><FONT color="#0000BB">22</FONT><FONT color="#007700">
  45  ,</FONT><FONT color="#0000BB">14</FONT><FONT color="#007700">,</FONT><FONT
  46  color="#0000BB">5</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
  47  9</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">21</FONT><FONT
  48  color="#007700">,</FONT><FONT color="#0000BB">13</FONT><FONT color="#007700">
  49  );
  50  <BR></FONT><FONT color="#0000BB">$lineplot2</FONT><FONT color="#007700">
  51  =new&nbsp;</FONT><FONT color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT
  52  color="#0000BB">$ydata2</FONT><FONT color="#007700">);
  53  <BR></FONT><FONT color="#0000BB">$lineplot2</FONT><FONT color="#007700">
  54  -&gt;</FONT><FONT color="#0000BB">SetColor</FONT><FONT color="#007700">(</FONT><FONT
  55  color="#DD0000">&quot;orange&quot;</FONT><FONT color="#007700">);
  56  <BR></FONT><FONT color="#0000BB">$lineplot2</FONT><FONT color="#007700">
  57  -&gt;</FONT><FONT color="#0000BB">SetWeight</FONT><FONT color="#007700">(</FONT><FONT
  58  color="#0000BB">2</FONT><FONT color="#007700">);
  59  <BR>
  60  <BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
  61  color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  62  $lineplot2</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
  63  </FONT></CODE></DIV></P>
  64  <P> Making these changes to the previous graph script would generate a
  65   new graph as illustrated below.<DIV class="example">
  66  <BR> <A href="exframes/frame_example4.html" target="blank"><IMG border="0"
  67  HEIGHT="200"  src="img/example4.png" WIDTH="300"></A>
  68  <BR><B>Figure 9:</B> Adding a second plot to the previous graph <A href="exframes/frame_example4.html"
  69  target="blank">[src]</A>&nbsp;
  70  <P></P>
  71  </DIV></P>
  72  <P> There is a few things worth noting here</P>
  73  <UL>
  74  <LI>The Y-scale has changed to accommodate the larger range of Y-values
  75   for the second graph.</LI>
  76  <LI>If you add several plots to the same graph they should contain the
  77   same number of data points. This is not a requirement (the graph will
  78   be automatically scaled to accommodate the plot with the largest number
  79   of points) but it will not look very good since one of the plot end in
  80   the middle of the graph.</LI>
  81  </UL>
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