1# Matrix Operations (Mat) 2 3PETSc matrices (`Mat` objects) are used to store Jacobians and other sparse matrices 4in PDE-based (or other) simulations. Users guide chapter: [](ch_matrices). See also [](../MatGraphOperations/index). 5 6<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/tutorials/index.html">Examples</A><BR> 7