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## Copyright (C) 1995, 1996, 1997 Friedrich Leisch
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this file. If not, write to the Free Software Foundation,
## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
## usage: run_count (x, n)
##
## Counts the upward runs in the columns of x of length 1, 2, ... n-1
## and >= n.
## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
## Description: Count upward runs
function retval = run_count (x, n)
[xr, xc] = size(x);
tmp = zeros (xr,xc);
retval = zeros (n, xc);
for j = 1 : xc
run = 1;
count = 1;
for k = 2 : xr
if x(k, j) < x(k-1, j)
tmp(run, j) = count;
run = run + 1;
count = 0;
endif
count = count + 1;
endfor
tmp(run, j) = count;
endfor
for k=1 : (n-1)
retval(k, :) = sum (tmp == k);
endfor
retval(n, :) = sum (tmp >= n);
endfunction
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