48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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QM DSP Library
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Centre for Digital Music, Queen Mary, University of London.
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This file copyright 2008 Kurt Jacobson.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#include "CosineDistance.h"
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#include <iostream>
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#include <limits>
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using std::cerr;
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double CosineDistance::distance(const vector<double> &v1,
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const vector<double> &v2)
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{
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dist = 1.0; dDenTot = 0; dDen1 = 0; dDen2 = 0; dSum1 =0;
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double small = 1e-20;
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//check if v1, v2 same size
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if (v1.size() != v2.size())
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{
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cerr << "CosineDistance::distance: ERROR: vectors not the same size\n";
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return 1.0;
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}
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else
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{
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for(int i=0; i<v1.size(); i++)
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{
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dSum1 += v1[i]*v2[i];
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dDen1 += v1[i]*v1[i];
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dDen2 += v2[i]*v2[i];
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}
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dDenTot = sqrt(fabs(dDen1*dDen2)) + small;
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dist = 1-((dSum1)/dDenTot);
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return dist;
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}
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}
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