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ranks.m
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1997-02-19
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## Copyright (C) 1995, 1996, 1997 Kurt Hornik
##
## 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: ranks (x)
##
## If x is a vector, return the (column) vector of ranks of x adjusted
## for ties.
## If x is a matrix, do the above for each column of x.
## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
## Description: Compute ranks
## This code is rather ugly, but is there an easy way to get the ranks
## adjusted for ties from sort?
function y = ranks (x)
if (nargin != 1)
usage ("ranks (x)");
endif
y = [];
[r, c] = size (x);
if ((r == 1) && (c > 0))
p = x' * ones (1, c);
y = sum (p < p') + (sum (p == p') + 1) / 2;
elseif (r > 1)
o = ones (1, r);
for i = 1 : c;
p = x (:, i) * o;
y = [y, ( sum (p < p') + (sum (p == p') + 1) / 2 )'];
endfor
endif
endfunction