HIST  Histogram.
    N = HIST(Y) bins the elements of Y into 10 equally spaced containers
    and returns the number of elements in each container.  If Y is a
    matrix, HIST works down the columns.
 
    N = HIST(Y,M), where M is a scalar, uses M bins.
 
    N = HIST(Y,X), where X is a vector, returns the distribution of Y
    among bins with centers specified by X.  Note: Use HISTC if it is
    more natural to specify bin edges instead.
 
    [N,X] = HIST(...) also returns the position of the bin centers in X.
 
    HIST(...) without output arguments produces a histogram bar plot of
    the results.
 
    See also HISTC.