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<TITLE>MatSetUp</TITLE>
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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/Mat/MatSetUp.html "><small>Report Typos and Errors</small></a></div>
<A NAME="MatSetUp"><H1>MatSetUp</H1></A>
Sets up the internal matrix data structures for later use.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatSetUp.html#MatSetUp">MatSetUp</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> A)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD>- the <A HREF="../Mat/Mat.html#Mat">Mat</A> context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
If the user has not set preallocation for this matrix then a default preallocation that is likely to be inefficient is used.
<P>
If a suitable preallocation routine is used, this function does not need to be called.
<P>
See the Performance chapter of the PETSc users manual for how to preallocate matrices
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreate.html#MatCreate">MatCreate</A>(), <A HREF="../Mat/MatDestroy.html#MatDestroy">MatDestroy</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/interface/matrix.c.html#MatSetUp">src/mat/interface/matrix.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/mat/tutorials/ex4.c.html">src/mat/tutorials/ex4.c.html</A><BR>
<A HREF="../../../src/mat/tutorials/ex8.c.html">src/mat/tutorials/ex8.c.html</A><BR>
<A HREF="../../../src/mat/tutorials/ex4f.F90.html">src/mat/tutorials/ex4f.F90.html</A><BR>
<A HREF="../../../src/ksp/pc/tutorials/ex3.c.html">src/ksp/pc/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex1.c.html">src/ksp/ksp/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex5.c.html">src/ksp/ksp/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex6.c.html">src/ksp/ksp/tutorials/ex6.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex8.c.html">src/ksp/ksp/tutorials/ex8.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex9.c.html">src/ksp/ksp/tutorials/ex9.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex11.c.html">src/ksp/ksp/tutorials/ex11.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex12.c.html">src/ksp/ksp/tutorials/ex12.c.html</A><BR>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/dm/impls/da/hypre/mhyp.c.html#MatSetUp_HYPREStruct">MatSetUp_HYPREStruct in src/dm/impls/da/hypre/mhyp.c</A><BR>
<A HREF="../../../src/dm/impls/da/hypre/mhyp.c.html#MatSetUp_HYPRESStruct">MatSetUp_HYPRESStruct in src/dm/impls/da/hypre/mhyp.c</A><BR>
<A HREF="../../../src/mat/impls/aij/mpi/mpiaij.c.html#MatSetUp_MPIAIJ">MatSetUp_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/aij.c.html#MatSetUp_SeqAIJ">MatSetUp_SeqAIJ in src/mat/impls/aij/seq/aij.c</A><BR>
<A HREF="../../../src/mat/impls/baij/mpi/mpibaij.c.html#MatSetUp_MPIBAIJ">MatSetUp_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c</A><BR>
<A HREF="../../../src/mat/impls/baij/seq/baij.c.html#MatSetUp_SeqBAIJ">MatSetUp_SeqBAIJ in src/mat/impls/baij/seq/baij.c</A><BR>
<A HREF="../../../src/mat/impls/dense/mpi/mpidense.c.html#MatSetUp_MPIDense">MatSetUp_MPIDense in src/mat/impls/dense/mpi/mpidense.c</A><BR>
<A HREF="../../../src/mat/impls/dense/seq/dense.c.html#MatSetUp_SeqDense">MatSetUp_SeqDense in src/mat/impls/dense/seq/dense.c</A><BR>
<A HREF="../../../src/mat/impls/elemental/matelem.cxx.html#MatSetUp_Elemental">MatSetUp_Elemental in src/mat/impls/elemental/matelem.cxx</A><BR>
<A HREF="../../../src/mat/impls/hypre/mhypre.c.html#MatSetUp_HYPRE">MatSetUp_HYPRE in src/mat/impls/hypre/mhypre.c</A><BR>
<A HREF="../../../src/mat/impls/kaij/kaij.c.html#MatSetUp_KAIJ">MatSetUp_KAIJ in src/mat/impls/kaij/kaij.c</A><BR>
<A HREF="../../../src/mat/impls/maij/maij.c.html#MatSetUp_MAIJ">MatSetUp_MAIJ in src/mat/impls/maij/maij.c</A><BR>
<A HREF="../../../src/mat/impls/preallocator/matpreallocator.c.html#MatSetUp_Preallocator">MatSetUp_Preallocator in src/mat/impls/preallocator/matpreallocator.c</A><BR>
<A HREF="../../../src/mat/impls/sbaij/mpi/mpisbaij.c.html#MatSetUp_MPISBAIJ">MatSetUp_MPISBAIJ in src/mat/impls/sbaij/mpi/mpisbaij.c</A><BR>
<A HREF="../../../src/mat/impls/sbaij/seq/sbaij.c.html#MatSetUp_SeqSBAIJ">MatSetUp_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaij.c</A><BR>
<A HREF="../../../src/mat/impls/scalapack/matscalapack.c.html#MatSetUp_ScaLAPACK">MatSetUp_ScaLAPACK in src/mat/impls/scalapack/matscalapack.c</A><BR>
<A HREF="../../../src/mat/impls/sell/mpi/mpisell.c.html#MatSetUp_MPISELL">MatSetUp_MPISELL in src/mat/impls/sell/mpi/mpisell.c</A><BR>
<A HREF="../../../src/mat/impls/sell/seq/sell.c.html#MatSetUp_SeqSELL">MatSetUp_SeqSELL in src/mat/impls/sell/seq/sell.c</A><BR>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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