# Matrix Data Structures¶

The SUNDIALS library comes packaged with a variety of SUNMatrix implementations, designed for simulations requiring direct linear solvers for problems in serial or shared-memory parallel environments. SUNDIALS additionally provides a simple interface for generic matrices (akin to a C++ abstract base class). All of the major SUNDIALS packages (CVODE(s), IDA(s), KINSOL, ARKODE), are constructed to only depend on these generic matrix operations, making them immediately extensible to new user-defined matrix objects. For each of the SUNDIALS-provided matrix types, SUNDIALS also provides at least two SUNLinearSolver implementations that factor these matrix objects and use them in the solution of linear systems.