# Matrix Operations (Mat)

PETSc matrices (`Mat` objects) are used to store Jacobians and other sparse matrices
in PDE-based (or other) simulations.  Users guide chapter: [](ch_matrices). See also [](../MatGraphOperations/index).

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/tutorials/index.html">Examples</A><BR>
