# 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).
Examples
Source files
fdmpiaij.c
mmaij.c
mpb_aij.c
mpiaij.c
mpiaij.h
mpiaijpc.c
mpihashmat.h
mpimatmatmatmult.c
mpimatmatmult.c
mpimattransposematmult.c
mpiov.c
mpiptap.c
Directories
aijmkl
aijperm
aijsell
crl
ftn-custom
kokkos
mkl_cpardiso
mpicusparse
mpihipsparse
mpiviennacl
mpiviennaclcuda
mumps
pastix
strumpack
superlu_dist