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2 bj 1 
#include "statistics.h"
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#include "Mat2x2f.h"
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#include "Mat3x3f.h"
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#include "Mat4x4f.h"
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using namespace std;
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namespace CGLA
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{
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  template<class VT, class MT>
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  VT covariance(const vector<VT>& vec, MT& C_out)
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  {
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    VT m = mean(vec);
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    int n = vec.size();
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    MT C(0);
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    for(int i=0;i<n;++i)
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      {
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	MT B;
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	VT v = vec[i]-m;
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	outer_product(v,v,B);
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	C += B;
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      }
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    C_out = C;
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    return m;
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  }
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  template
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  Vec2f covariance<Vec2f,Mat2x2f>(const vector<Vec2f>& vec, Mat2x2f& C_out);
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  template
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  Vec3f covariance<Vec3f,Mat3x3f>(const vector<Vec3f>& vec, Mat3x3f& C_out);
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  template
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  Vec4f covariance<Vec4f,Mat4x4f>(const vector<Vec4f>& vec, Mat4x4f& C_out);
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}