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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
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