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  template<class VT>

		template<class VT>

    VT mean(const std::vector<VT>& vec)

				VT mean(const std::vector<VT>& vec)

    {

				{

      VT v(0);

						VT v(0);

      for(int i=0;i<vec.size();++i)

						for(unsigned int i=0;i<vec.size();++i)

	v += vec[i];

								v += vec[i];

      v /= vec.size();

						v /= vec.size();

      return v;

						return v;

    }

				}

  /** Function that computes the covariance of a set of points.

		/** Function that computes the covariance of a set of points.

      This function returns the mean, and, upon completion, the

				This function returns the mean, and, upon completion, the

      final argument contains the covariance matrix.

				final argument contains the covariance matrix.

      This template is instantiated for Vec3f, Vec2f, and Vec4f. */

				This template is instantiated for Vec3f, Vec2f, and Vec4f. */

  template<class VT, class MT>

		template<class VT, class MT>

    VT covariance(const std::vector<VT>& vec, MT& C_out);

				VT covariance(const std::vector<VT>& vec, MT& C_out);