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

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