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Next: <a href="The-2D-histogram-struct.html#The-2D-histogram-struct" accesskey="n" rel="next">The 2D histogram struct</a>, Previous: <a href="Example-programs-for-histograms.html#Example-programs-for-histograms" accesskey="p" rel="previous">Example programs for histograms</a>, Up: <a href="Histograms.html#Histograms" accesskey="u" rel="up">Histograms</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Two-dimensional-histograms-1"></a>
<h3 class="section">23.12 Two dimensional histograms</h3>
<a name="index-two-dimensional-histograms"></a>
<a name="index-2D-histograms"></a>

<p>A two dimensional histogram consists of a set of <em>bins</em> which count
the number of events falling in a given area of the <em>(x,y)</em>
plane.  The simplest way to use a two dimensional histogram is to record
two-dimensional position information, <em>n(x,y)</em>.  Another possibility
is to form a <em>joint distribution</em> by recording related
variables.  For example a detector might record both the position of an
event (<em>x</em>) and the amount of energy it deposited <em>E</em>.  These
could be histogrammed as the joint distribution <em>n(x,E)</em>.
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