Histogram
Show the distribution of data values
Plotted Variables
Y) -- distribute elements in vector Y into 10 equally spaced bins (displayed as bars). If Y is a matrix, each column of Y is treated as a vector.
Y,x) -- distribute elements in Y into length(x) bins centered on the x-axis at elements in x. x can also be a scalar, which specifies only the number of bins.
More Information
See the hist reference page for more information.