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<HR NOSHADE>
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<H3><A NAME="8_3_1">8.3.1 Using line error plots</A></H3>
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<P> A line error plot is an error plot with the addition that a line is
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drawn between the average value of each error pair. You use this type
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of plot the exact same way you would use an error plot. The only change
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is that you must instantiated an <A href="../ref/ErrorPlot.html#_C_ERRORPLOT">
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ErrorLinePlot()</A> instead and make sure you have included the
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"jpgraph_line.php" since the line error plot makes use of the line plot
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class to stroke the line.</P>
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<P> To control the various properties of the line drawn the "line"
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property of the error line plot may be accessed. So, for example, if
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you want the line to be 2 pixels wide and blue you would have to add
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the following two lines<DIV class="phpscript"><CODE><FONT color="#000000">
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<FONT color="#0000BB"> $elplot</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">line</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetWeight</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">2</FONT><FONT
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color="#007700">);
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<BR></FONT><FONT color="#0000BB">$elplot</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">line</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"blue"</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
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</FONT></CODE></DIV></P>
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<P>to generate the graph as shown below<DIV class="example">
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<BR> <A href="exframes/frame_example15.html" target="blank"><IMG border="0"
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HEIGHT="200" src="img/example15.png" WIDTH="300"></A>
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<BR><B>Figure 55:</B> Linear error plot <A href="exframes/frame_example15.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> You may of course add legends to none, one or both of the line types
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in the above graph. So for example if we wanted the legend "Min/Max"
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for the red error bars and a legend "Average" for the blue line you
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would have to add the lines<DIV class="phpscript"><CODE><FONT color="#000000">
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<FONT color="#0000BB"> $errplot</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">SetLegend</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"Min/Max"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$errplot</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">line</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetLegend</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"Average"</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
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</FONT></CODE></DIV></P>
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<P> The resulting graph will now look like (note that we are using the
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default placement of the legend box)<DIV class="example">
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<BR> <A href="exframes/frame_example16.html" target="blank"><IMG border="0"
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HEIGHT="200" src="img/example16.png" WIDTH="300"></A>
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<BR><B>Figure 56:</B> Addding a legend box to the line error plot. <A href="exframes/frame_example16.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></P>
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