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

<p>

<p>
Directories
<p><a href="gather/index.html">gather</a><br>
<a href="ptscotch/index.html">ptscotch</a><br>
<a href="multistage/index.html">multistage</a><br>
<a href="matpart/index.html">matpart</a><br>
<a href="parmetis/index.html">parmetis</a><br>
<a href="shell/index.html">shell</a><br>
<a href="simple/index.html">simple</a><br>
<a href="chaco/index.html">chaco</a><br>