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function h = histp(x, xmin, xmax, nbins)
%HISTP Histogram estimate of 1-dimensional probability distribution.
%
% Description
%
% HISTP(X, XMIN, XMAX, NBINS) takes a column vector X of data values
% and generates a normalized histogram plot of the distribution. The
% histogram has NBINS bins lying in the range XMIN to XMAX.
%
% H = HISTP(...) returns a vector of patch handles.
%
% See also
% DEMGAUSS
%
% Copyright (c) Ian T Nabney (1996-2001)
ndata = length(x);
bins = linspace(xmin, xmax, nbins);
binwidth = (xmax - xmin)/nbins;
num = hist(x, bins);
num = num/(ndata*binwidth);
h = bar(bins, num, 0.6);
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