545         DenseMatrix refMat1 = DenseMatrix::Zero(rows, cols);  in sparse_basic()  local
546         initSparse<Scalar>(density, refMat1, m1);  in sparse_basic()
549         refMat1.conservativeResize(rows+incRows, cols+incCols);  in sparse_basic()
550         if (incRows > 0) refMat1.bottomRows(incRows).setZero();  in sparse_basic()
551         if (incCols > 0) refMat1.rightCols(incCols).setZero();  in sparse_basic()
553         VERIFY_IS_APPROX(m1, refMat1);  in sparse_basic()
557           m1.insert(m1.rows()-1, 0) = refMat1(refMat1.rows()-1, 0) = 1;  in sparse_basic()
559           m1.insert(0, m1.cols()-1) = refMat1(0, refMat1.cols()-1) = 1;  in sparse_basic()
561         VERIFY_IS_APPROX(m1, refMat1);  in sparse_basic()
569     DenseMatrix refMat1 = DenseMatrix::Identity(rows, rows);  in sparse_basic()  local
572     VERIFY_IS_APPROX(m1, refMat1);  in sparse_basic()
579       refMat1.coeffRef(i,j) = v;  in sparse_basic()
580       VERIFY_IS_APPROX(m1, refMat1);  in sparse_basic()
585     refMat1.setIdentity();  in sparse_basic()
586     VERIFY_IS_APPROX(m1, refMat1);  in sparse_basic()