# 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 [](../MatOrderings/index).
Examples
amd/
metisnd/
degree.c
fn1wd.c
fndsep.c
fnroot.c
gen1wd.c
gennd.c
genqmd.c
genrcm.c
qmdmrg.c
qmdqt.c
qmdrch.c
qmdupd.c
rcm.c
rootls.c
sorder.c
sp1wd.c
spectral.c
spnd.c
spqmd.c
sprcm.c
sregis.c
wbm.c
makefile