# 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>

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Directories
<p><a href="interface/index.html">interface</a><br>
<a href="matfd/index.html">matfd</a><br>
<a href="impls/index.html">impls</a><br>
<a href="graphops/index.html">graphops</a><br>
<a href="ftn-custom/index.html">ftn-custom</a><br>
<a href="f90-mod/index.html">f90-mod</a><br>
<a href="tests/index.html">tests</a><br>
<a href="utils/index.html">utils</a><br>
<a href="tutorials/index.html">tutorials</a><br>
<a href="ftn-kernels/index.html">ftn-kernels</a><br>