## CSRMatrix

CSRMatrix is defined to handle Compressed Sparse Row matrix.

CSRMatrix is defined to handle Compressed Sparse Row matrix.

CSRSparsity is a user type for storing the compressed sparse row sparse matrix.

ScalarMeshField is a subclass of AbstractMeshField. It is used to store scalar variables defined on elements of mesh. We can define the variable either on the nodes of the finite element, or we can define these variables on the quadrature points.