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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. ./configure --download-umfpack to install PETSc to use UMFPACK
<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_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 <AUTO> (choose one of) AUTO UNSYMMETRIC SYMMETRIC 2BY2</B></TD><TD>- . -mat_umfpack_dense_col <alpha_c> - 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 <0.2>: Control[UMFPACK_DENSE_ROW] </B></TD><TD>- . -mat_umfpack_amd_dense <10>: Control[UMFPACK_AMD_DENSE]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_block_size <bs> </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 <0.01>: Control[UMFPACK_2BY2_TOLERANCE] </B></TD><TD>- . -mat_umfpack_fixq <0>: Control[UMFPACK_FIXQ]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_aggressive <1>: Control[UMFPACK_AGGRESSIVE] </B></TD><TD>- . -mat_umfpack_pivot_tolerance <delta> - 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 <0.001>: Control[UMFPACK_SYM_PIVOT_TOLERANCE] </B></TD><TD>- . -mat_umfpack_scale <NONE> (choose one of) NONE SUM MAX
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_umfpack_alloc_init <delta> </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 <0>: Control[UMFPACK_DROPTOL] </B></TD><TD>- - -mat_umfpack_irstep <maxit> - UMFPACK maximum number of iterative refinement steps: Control[UMFPACK_IRSTEP]
</TD></TR>
<P>
<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="../Mat/MATSOLVERSPOOLES.html#MATSOLVERSPOOLES">MATSOLVERSPOOLES</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>
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