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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2000 - 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-en.txt
//
function q=quart(x,orien)
//
//This function computes the quartiles of a vector or a matrix x.
//
//For a vector or a matrix x, q=quart(x) returns in the vector q the
//three quartiles entries of x.
//
//q=quart(x,'r') (or, equivalently, q=quart(x,1)) is the rowwise
//quartiles range. It returns in each column of the 3xlength(x)-matrix
//q, the quartiles of the corresponding column of x.
//
//q=quart(x,'c') (or, equivalently, q=quart(x,2)) is the columnwise
//interquartile range. It returns in each row of length(x)x3-matrix q
//the quartiles of each row of x.
//
//
function y = vperctl(x,p)
//inline function wich computes percentiles of a vector
k=isnan(x)
x(k)=[];
n=size(x,'*')
x=gsort(x,'g','i')
data=[0 100*(0.5:(n-0.5))./n 100;
x(1), matrix(x,1,-1), x(n)]
y=interpln(data,p);
endfunction
if x==[] then q=%nan, return, end
[lhs,rhs]=argn(0)
if rhs==0 then error(msprintf(gettext("%s: Wrong number of input argument: At least %d expected.\n"),"quart",1)), end
if rhs==1 then
q=vperctl(x(:),[25 50 75])
q=q(:)
else
q=[]
if orien=='r'|orien==1 then
for i=x
p=vperctl(i,[25 50 75])
q=[q p(:)]
end
else
for i=x'
p=vperctl(i,[25 50 75])
q=[q;p(:)']
end
end
end
endfunction
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