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  28  <H3><A NAME="8_2_5">8.2.5 Using grouped bar plots</A></H3>
  29  <P> These types of bar graph is used to easy group two or more bars
  30   together around each tick (X-value). The bars will be placed
  31   immediately beside each other and as a group centered on each tick
  32   mark. A grouped bar is created by aggregating two or more ordinary bar
  33   graphs and creating a <A href="../ref/GroupBarPlot.html#_C_GROUPBARPLOT">
  34   GroupBarPlot()</A> From two ordinary bar graphs along the lines of<DIV class="phpscript">
  35  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;</FONT><FONT color="#FF8000">
  36  //&nbsp;Create&nbsp;the&nbsp;bar&nbsp;plots
  37  <BR></FONT><FONT color="#0000BB">$b1plot&nbsp;</FONT><FONT color="#007700">
  38  =&nbsp;new&nbsp;</FONT><FONT color="#0000BB">BarPlot</FONT><FONT color="#007700">(</FONT><FONT
  39  color="#0000BB">$data1y</FONT><FONT color="#007700">);
  40  <BR></FONT><FONT color="#0000BB">$b1plot</FONT><FONT color="#007700">-&gt;</FONT><FONT
  41  color="#0000BB">SetFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  42  &quot;orange&quot;</FONT><FONT color="#007700">);
  43  <BR>
  44  <BR></FONT><FONT color="#0000BB">$b2plot&nbsp;</FONT><FONT color="#007700">
  45  =&nbsp;new&nbsp;</FONT><FONT color="#0000BB">BarPlot</FONT><FONT color="#007700">(</FONT><FONT
  46  color="#0000BB">$data2y</FONT><FONT color="#007700">);
  47  <BR></FONT><FONT color="#0000BB">$b2plot</FONT><FONT color="#007700">-&gt;</FONT><FONT
  48  color="#0000BB">SetFillColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  49  &quot;blue&quot;</FONT><FONT color="#007700">);
  50  <BR>
  51  <BR></FONT><FONT color="#FF8000">//&nbsp;Create&nbsp;the&nbsp;grouped&nbsp;bar&nbsp;plot
  52  <BR></FONT><FONT color="#0000BB">$gbplot&nbsp;</FONT><FONT color="#007700">
  53  =&nbsp;new&nbsp;</FONT><FONT color="#0000BB">GroupBarPlot</FONT><FONT color="#007700">
  54  (array(</FONT><FONT color="#0000BB">$b1plot</FONT><FONT color="#007700">
  55  ,</FONT><FONT color="#0000BB">$b2plot</FONT><FONT color="#007700">));
  56  <BR>
  57  <BR></FONT><FONT color="#FF8000">//&nbsp;...and&nbsp;add&nbsp;it&nbsp;to&nbsp;the&nbsp;graPH
  58  <BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
  59  color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  60  $gbplot</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
  61  </FONT></CODE></DIV></P>
  62  <P> The following example illustrates this type of graph<DIV class="example">
  63  <BR> <A href="exframes/frame_example21.html" target="blank"><IMG border="0"
  64  HEIGHT="200"  src="img/example21.png" WIDTH="310"></A>
  65  <BR><B>Figure 36:</B> A grouped bar plot <A href="exframes/frame_example21.html"
  66  target="blank">[src]</A>&nbsp;
  67  <P></P>
  68  </DIV></P>
  69  <P> There is no limit on the number of plots you may group together.</P>
  70  <P> If you use the SetWidth() method on the GroupBarPlot() this will
  71   affect the total width used by all the added plots. Each individual bar
  72   width will be the same for all added bars. The default width for
  73   grouped bar is 70%.</P>
  74  <P> Setting the grouped with to 0.9 would result in the image below.<DIV class="example">
  75  <BR> <A href="exframes/frame_example22.html" target="blank"><IMG border="0"
  76  HEIGHT="200"  src="img/example22.png" WIDTH="310"></A>
  77  <BR><B>Figure 37:</B> Adjusting the width for a gropued bar plot. <A href="exframes/frame_example22.html"
  78  target="blank">[src]</A>&nbsp;
  79  <P></P>
  80  </DIV></P>
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