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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 1999 - INRIA - Carlos Klimann
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
//
function [q]=iqr(x,orien)
//
//This function computes the interquartile range IQR= upper quartile -
//lower quartile of a vector or a matrix x.
//
//For a vector or a matrix x, q=iqr(x) returns in the scalar q the
//interquartile range of all the entries of x.
//
//q=iqr(x,'r') (or, equivalently, q=iqr(x,1)) is the rowwise
//interquartile range. It returns in each entry of the row vector q the
//interquartile range of each column of x.
//
//q-iqr(x,'c') (or, equivalently, q=iqr(x,2)) is the columnwise
//interquartile range. It returns in each entry of the column vector q
//the interquartile range of each row of x.
//
//References: Wonacott, T.H. & Wonacott, R.J.; Introductory
//Statistics, J.Wiley & Sons, 1990.
//
//
[lhs,rhs] = argn(0);
if rhs == 0 then
error(msprintf(gettext("%s: Wrong number of input argument: At least %d expected.\n"),"iqr",1));
end
if rhs == 1 then
if x == [] | and(isnan(x)) then
q = %nan;
return
end
qq = quart(x)
q = qq(3) - qq(1);
else
qq=quart(x,orien);
if orien == "r" | orien == 1 then
if size(x,1) == 1 then
error(msprintf(_("%s: Wrong dimensions for input argument #%d: A column vector or matrix expected.\n"), "iqr", 1));
end
q = qq(3, :) - qq(1, :);
elseif orien == "c" | orien == 2 then
if size(x,2) == 1 then
error(msprintf(_("%s: Wrong dimensions for input argument #%d: A row vector or matrix expected.\n"), "iqr", 1));
end
q = qq(:,3) - qq(:, 1);
else
error(msprintf(_("%s: Wrong value for input argument #%d: ''%s'', %d, ''%s'' or %d expected.\n"), "iqr", 2, "r", 1, "c", 2));
end
end
endfunction
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