Next: The 2D histogram struct, Previous: Example programs for histograms, Up: Histograms [Index]

A two dimensional histogram consists of a set of *bins* which count
the number of events falling in a given area of the *(x,y)*
plane. The simplest way to use a two dimensional histogram is to record
two-dimensional position information, *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 (*x*) and the amount of energy it deposited *E*. These
could be histogrammed as the joint distribution *n(x,E)*.