returns a org.ejml.interfaces.decomposition.qrdecomposition that has been optimized for the specified matrix size . concode_field_sep PlaceHolder placeHolder concode_field_sep SingularValueDecomposition<DenseMatrix64F> svd concode_elem_sep TridiagonalSimilarDecomposition<DenseMatrix64F> tridiagonal concode_elem_sep EigenDecomposition<DenseMatrix64F> eig concode_elem_sep EigenDecomposition<DenseMatrix64F> eig concode_elem_sep boolean decomposeSafe concode_elem_sep LUDecomposition<DenseMatrix64F> lu concode_elem_sep CholeskyDecomposition<DenseMatrix64F> chol concode_elem_sep CholeskyDecompositionLDL_D64 cholLDL concode_elem_sep QRPDecomposition<DenseMatrix64F> qrp concode_elem_sep double quality concode_elem_sep double quality concode_elem_sep double quality