/usr/share/octave/packages/plot-1.1.0/hist2d.m is in octave-plot 1.1.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | ## Copyright (C) 2006 Paul Kienzle <pkienzle@users.sf.net>
## This program is in the public domain
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{counts}, @var{xbins}, @var{ybins}] =} hist2d ([@var{x}, @var{y}], @var{xbins}, @var{ybins}, @var{norm})
## Produce a 2D histogram.
##
## Points xi,yi are stored in a 2-column array.
## If ybins is missing, use xbins.
## If bins is a scalar, use that many bins.
## If bins is a vector, it represents bin edges.
##
## @end deftypefn
function [ret_counts, xbins, ybins] = hist2d(M,xbins,ybins)
if nargin < 1 && nargin > 3
print_usage
end
lo = min(M);
hi = max(M);
if nargin == 1
ybins = xbins = 10;
elseif nargin == 2
ybins = xbins;
endif
# If n bins, find centers based on n+1 bin edges
if isscalar(xbins)
xbins = linspace(lo(1),hi(1),xbins+1);
xbins = (xbins(1:end-1)+xbins(2:end))/2;
end
if isscalar(ybins)
ybins = linspace(lo(2),hi(2),ybins+1);
ybins = (ybins(1:end-1)+ybins(2:end))/2;
end
xcut = (xbins(1:end-1)+xbins(2:end))/2;
ycut = (ybins(1:end-1)+ybins(2:end))/2;
xidx = lookup(xcut,M(:,1))+1;
yidx = lookup(ycut,M(:,2))+1;
counts = sparse(xidx,yidx,1,length(xbins),length(ybins),'sum');
if nargout
ret_counts = full(counts');
else
mesh(xbins,ybins,full(counts'));
end
endfunction
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