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Diffstat (limited to 'modules/statistics/macros/moment.sci')
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diff --git a/modules/statistics/macros/moment.sci b/modules/statistics/macros/moment.sci new file mode 100755 index 000000000..089020a51 --- /dev/null +++ b/modules/statistics/macros/moment.sci @@ -0,0 +1,48 @@ + +// 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 [mom]= moment(x,ord,orien) + // + //This function computes the non central moment of all orders of a + //vector or matrix x. + // + //For a vector or matrix x, mom=moment(x,ord) returns in the scalar mom + //the moment of order ord of all the entries of x. + // + //mom=moment(x,ord,'r')(or, equivalently, mom=moment(x,ord,1)) returns + //in each entry of the row vector mom the moment of order ord of each + //column of x. + // + //mom=moment(x,ord,'c')(or, equivalently, mom=cmoment(x,ord,2)) returns + //in each entry of the column vector mom the moment of order ord of each + //row of x. + // + //Nota: In the calculations the divisor is n, where n is the dimension + //of the data vector. + // + //References: Wonacott, T.H. & Wonacott, R.J.; Introductory + //Statistics, J.Wiley & Sons, 1990. + // + // + [lhs,rhs]=argn(0) + if rhs==2 then + if x==[] then mom=%nan, return, end + le=length(x) + mom=sum(x.^ord)/le + elseif rhs==3 then + if x==[] then mom=%nan, return, end + le=size(x,orien) + mom=sum((x.^ord),orien)/le + else + error(msprintf(gettext("%s: Wrong number of input argument: %d to %d expected.\n"),"moment",2,3)), + end +endfunction |