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  28  <H3><A NAME="8_3_1">8.3.1 Using line error plots</A></H3>
  29  <P> A line error plot is an error plot with the addition that a line is
  30   drawn between the average value of each error pair. You use this type
  31   of plot the exact same way you would use an error plot. The only change
  32   is that you must instantiated an <A href="../ref/ErrorPlot.html#_C_ERRORPLOT">
  33   ErrorLinePlot()</A> instead and make sure you have included the
  34   &quot;jpgraph_line.php&quot; since the line error plot makes use of the line plot
  35   class to stroke the line.</P>
  36  <P> To control the various properties of the line drawn the &quot;line&quot;
  37   property of the error line plot may be accessed. So, for example, if
  38   you want the line to be 2 pixels wide and blue you would have to add
  39   the following two lines<DIV class="phpscript"><CODE><FONT color="#000000">
  40   <FONT color="#0000BB">&nbsp;$elplot</FONT><FONT color="#007700">-&gt;</FONT><FONT
  41  color="#0000BB">line</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  42  SetWeight</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">2</FONT><FONT
  43  color="#007700">);
  44  <BR></FONT><FONT color="#0000BB">$elplot</FONT><FONT color="#007700">-&gt;</FONT><FONT
  45  color="#0000BB">line</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  46  SetColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  47  &quot;blue&quot;</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
  48  </FONT></CODE></DIV></P>
  49  <P>to generate the graph as shown below<DIV class="example">
  50  <BR> <A href="exframes/frame_example15.html" target="blank"><IMG border="0"
  51  HEIGHT="200"  src="img/example15.png" WIDTH="300"></A>
  52  <BR><B>Figure 55:</B> Linear error plot <A href="exframes/frame_example15.html"
  53  target="blank">[src]</A>&nbsp;
  54  <P></P>
  55  </DIV></P>
  56  <P> You may of course add legends to none, one or both of the line types
  57   in the above graph. So for example if we wanted the legend &quot;Min/Max&quot;
  58   for the red error bars and a legend &quot;Average&quot; for the blue line you
  59   would have to add the lines<DIV class="phpscript"><CODE><FONT color="#000000">
  60   <FONT color="#0000BB">&nbsp;$errplot</FONT><FONT color="#007700">-&gt;</FONT><FONT
  61  color="#0000BB">SetLegend</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  62  &quot;Min/Max&quot;</FONT><FONT color="#007700">);
  63  <BR></FONT><FONT color="#0000BB">$errplot</FONT><FONT color="#007700">-&gt;</FONT><FONT
  64  color="#0000BB">line</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  65  SetLegend</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  66  &quot;Average&quot;</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
  67  </FONT></CODE></DIV></P>
  68  <P> The resulting graph will now look like (note that we are using the
  69   default placement of the legend box)<DIV class="example">
  70  <BR> <A href="exframes/frame_example16.html" target="blank"><IMG border="0"
  71  HEIGHT="200"  src="img/example16.png" WIDTH="300"></A>
  72  <BR><B>Figure 56:</B> Addding a legend box to the line error plot. <A href="exframes/frame_example16.html"
  73  target="blank">[src]</A>&nbsp;
  74  <P></P>
  75  </DIV></P>
  76  <P></P>
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