Function coeff

extensions/include/cuMat/src/SparseMatrix.h:135–142

* \brief Accesses a single entry, performs a search for the specific entry. * This is required by the \code AccessFlag::CwiseRead \endcode, * needed so that a sparse matrix can be used * \param row * \param col * \param batch * \return */

     * \return 
     */
    __device__ Scalar coeff(Index row, Index col, Index batch, Index /*linear*/) const
    {
		Index linear = internal::SparseMatrixIndexEvaluator<_SparseFlags>::coordsToLinear(sparsity_, row, col, batch);
		if (linear >= 0)
			return A_.getRawCoeff(linear);
		else
			return Scalar(0);
    }

	/**
	 * \brief Converts from the linear index back to row, column and batch index.