Mercurial > octave-nkf
view scripts/statistics/base/iqr.m @ 4681:bb9515a3527d
[project @ 2003-12-18 15:35:09 by jwe]
author | jwe |
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date | Thu, 18 Dec 2003 15:35:09 +0000 |
parents | cae0b7c46842 |
children | 28ab079d8f0e |
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## Copyright (C) 1995, 1996, 1997 Kurt Hornik ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} iqr (@var{x}) ## If @var{x} is a vector, return the interquartile range, i.e., the ## difference between the upper and lower quartile, of the input data. ## ## If @var{x} is a matrix, do the above for each column of @var{x}. ## @end deftypefn ## Author KH <Kurt.Hornik@ci.tuwien.ac.at> ## Description: Interquartile range function y = iqr (x) if (nargin != 1) usage ("iqr (x)"); endif if (rows (x) == 1) x = x.'; endif [r, c] = size (x); y = zeros (1, c); for i = 1:c; y(i) = empirical_inv (3/4, x(:,i)) - empirical_inv (1/4, x(:,i)); endfor endfunction