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   <div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="MATSOLVERUMFPACK"><H1>MATSOLVERUMFPACK</H1></A>
"umfpack" - A matrix type providing direct solvers (LU) for sequential matrices via the external package UMFPACK. Use ./configure --download-suitesparse to install PETSc to use UMFPACK
<P>
Use -pc_type lu -pc_factor_mat_solver_package umfpack to us this direct solver
<P>
Consult UMFPACK documentation for more information about the Control parameters
which correspond to the options database keys below.
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_ordering                </B></TD><TD>- CHOLMOD, AMD, GIVEN, METIS, BEST, NONE
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_prl                     </B></TD><TD>- UMFPACK print level: Control[UMFPACK_PRL]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_strategy &lt;AUTO&gt;         </B></TD><TD>- (choose one of) AUTO UNSYMMETRIC SYMMETRIC 2BY2
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_dense_col &lt;alpha_c&gt;     </B></TD><TD>- UMFPACK dense column threshold: Control[UMFPACK_DENSE_COL]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_dense_row &lt;0.2&gt;         </B></TD><TD>- Control[UMFPACK_DENSE_ROW]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_amd_dense &lt;10&gt;          </B></TD><TD>- Control[UMFPACK_AMD_DENSE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_block_size &lt;bs&gt;         </B></TD><TD>- UMFPACK block size for BLAS-Level 3 calls: Control[UMFPACK_BLOCK_SIZE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_2by2_tolerance &lt;0.01&gt;   </B></TD><TD>- Control[UMFPACK_2BY2_TOLERANCE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_fixq &lt;0&gt;                </B></TD><TD>- Control[UMFPACK_FIXQ]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_aggressive &lt;1&gt;          </B></TD><TD>- Control[UMFPACK_AGGRESSIVE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_pivot_tolerance &lt;delta&gt; </B></TD><TD>- UMFPACK partial pivot tolerance: Control[UMFPACK_PIVOT_TOLERANCE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_sym_pivot_tolerance &lt;0.001&gt; </B></TD><TD>- Control[UMFPACK_SYM_PIVOT_TOLERANCE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_scale &lt;NONE&gt;           </B></TD><TD>- (choose one of) NONE SUM MAX
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_alloc_init &lt;delta&gt;      </B></TD><TD>- UMFPACK factorized matrix allocation modifier: Control[UMFPACK_ALLOC_INIT]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_droptol &lt;0&gt;            </B></TD><TD>- Control[UMFPACK_DROPTOL]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_irstep &lt;maxit&gt;          </B></TD><TD>- UMFPACK maximum number of iterative refinement steps: Control[UMFPACK_IRSTEP]
</TD></TR></TABLE>
<P>

<P>
Note: UMFPACK is part of SuiteSparse <a href="http://faculty.cse.tamu.edu/davis/suitesparse.html">http://faculty.cse.tamu.edu/davis/suitesparse.html </a> <P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
 <A HREF="../PC/PCLU.html#PCLU">PCLU</A>, <A HREF="../Mat/MATSOLVERSUPERLU.html#MATSOLVERSUPERLU">MATSOLVERSUPERLU</A>, <A HREF="../Mat/MATSOLVERMUMPS.html#MATSOLVERMUMPS">MATSOLVERMUMPS</A>, <A HREF="../PC/PCFactorSetMatSolverPackage.html#PCFactorSetMatSolverPackage">PCFactorSetMatSolverPackage</A>(), <A HREF="../Mat/MatSolverPackage.html#MatSolverPackage">MatSolverPackage</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/impls/aij/seq/umfpack/umfpack.c.html#MATSOLVERUMFPACK">src/mat/impls/aij/seq/umfpack/umfpack.c</A>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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