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<HTML>
<HEAD>
<TITLE>Histograms</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<P><font size="+2" color="green">Histograms</font></P>
<P>
It is possible to draw four types of histograms using the
<a href="../Characteristics/PlottingSymbol/histogramtype.htm"><CODE>HISTOGRAMTYPE</CODE></a>
characteristic approach, or you can use the <CODE>\HISTOGRAM</CODE> qualifier to plot a histogram
with tails to <i>y=0</i> and profile along the <i>x</i>-axis.</p>
<P>
<font size="+1" color="green">Using the <TT>HISTOGRAMTYPE</TT> characteristic</font></P>
<P>
The table below shows the histogram type that will be produced depending on the value of
<CODE>HISTOGRAMTYPE</CODE>.</P>
<p>
<center>
<table border="1" cols="2">
<tr>
<td><CODE>HISTOGRAMTYPE</CODE></td>
<td align="center"><em>result</em></td></tr>
<tr><td align="center"><CODE>0</CODE></td><td>(default value) line graph, not a histogram</td>
</tr><tr>
<td align="center"><CODE>1</CODE></td>
<td valign="top">histogram with no tails and profile along the <I>x</I>-axis<br />
May control the width and colour individual bars</td>
</tr><tr>
<td align="center"><CODE>2</CODE></td>
<td valign="top">histogram with tails to <I>y=0</I> and profile along the <I>x</I>-axis<br />
May control the fill pattern, width, colour of each bar</td>
</tr><tr>
<td align="center"><CODE>3</CODE></td>
<td valign="top">histogram without tails and profile along the <I>y</I>-axis<br />
May control the height and colour of each bar
</tr><tr>
<td align="center"><CODE>4</CODE></td>
<td valign="top">histogram with tails to <I>x=0</I> and profile along the <I>y</I>-axis<br />
May control the fill pattern, height, colour of each bar</td>
</tr></table></center></p>
<P>
<font size="+1" color="green">Using the <TT>\HISTOGRAM</TT> qualifier</font></P>
<P>
The <CODE>\HISTOGRAM</CODE> qualifier is inconsistent when used in conjunction with the
<CODE>\AXESONLY</CODE> qualifier.</P>
<P>
Using the <CODE>\HISTOGRAM</CODE> qualifier is equivalent to using a <CODE>HISTOGRAMTYPE</CODE>
setting of <CODE>2</CODE>. A histogram with tails to <i>y=0</i> and profile
along the <i>x</i>-axis will be plotted. The following three commands:</P>
<p>
<font color="blue"><PRE>
SET HISTOGRAMTYPE 2 ! force histogram plotting
GRAPH X Y ! plot axes and histogram
SET HISTOGRAMTYPE 0 ! reset to default value
</PRE></font>
<P>
are equivalent to the single command:</P>
<font color="blue"><Pre>
GRAPH\HIST X Y</pre></font>
<P>
<font size="+1" color="green">Filling</font></P>
<P>
For information on how to fill the area under a histogram, see the
<CODE><a href="../Characteristics/GeneralGraph/areafillcolor/areafillcolor.htm">AREAFILLCOLOR</a></CODE>
characteristic. For histograms with tails, types <code>2</code> and <code>4</code>, it is possible to
fill each histogram bar with a different color. For types <code>1</code> and <code>3</code>,
the area under a histogram can be filled with a single color.</P>
<P>
For an example of various types of filled histograms see the
<a href="../Characteristics/GeneralGraph/areafillcolor/example2.htm">histogram example</a>.</P>
<P>
<a href="replotdata.htm"><img src="../shadow_left.gif">
<font size="+1" color="olive">Replot data on a common scale</font></a><br />
<a href="errorbars.htm"><img src="../shadow_right.gif">
<font size="+1" color="olive">Error bars</font></a></P>
</BODY>
</HTML>
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