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/* ----------------------------------------------------------------------- *
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 * This file is part of GEL, http://www.imm.dtu.dk/GEL
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 * Copyright (C) the authors and DTU Informatics
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 * For license and list of authors, see ../../doc/intro.pdf
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 * ----------------------------------------------------------------------- */
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/** @file statistics.h
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 * Compute mean and covariance of CGLA vectors - simple multivariate statistics.
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 */
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#ifndef __CGLA_STATISTICS_H__
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#define __CGLA_STATISTICS_H__
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#if (_MSC_VER >= 1200)
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#pragma warning (disable: 4018 4244 4800)
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#endif
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#include <vector>
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namespace CGLA
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{
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		template<class VT>
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				VT mean(const std::vector<VT>& vec)
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				{
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						VT v(0);
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						for(unsigned int i=0;i<vec.size();++i)
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								v += vec[i];
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						v /= vec.size();
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						return v;
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				}
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		/** Function that computes the covariance of a set of points.
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				This function returns the mean, and, upon completion, the
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				final argument contains the covariance matrix.
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				This template is instantiated for Vec3f, Vec2f, and Vec4f. */
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		template<class VT, class MT>
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				VT covariance(const std::vector<VT>& vec, MT& C_out);
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}
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#endif