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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</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-3.10.3 v3.10.3 docs/manualpages/Mat/MatZeroEntries.html "><small>Report Typos and Errors</small></a></div>
<A NAME="MatZeroEntries"><H1>MatZeroEntries</H1></A>
Zeros all entries of a matrix. For sparse matrices this routine retains the old nonzero structure.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatZeroEntries.html#MatZeroEntries">MatZeroEntries</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> mat)
</PRE>
Logically Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B>mat </B> -the matrix
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
If the matrix was not preallocated then a default, likely poor preallocation will be set in the matrix, so this should be called after the preallocation phase.
See the Performance chapter of the users manual for information on preallocating matrices.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatZeroRows.html#MatZeroRows">MatZeroRows</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/interface/matrix.c.html#MatZeroEntries">src/mat/interface/matrix.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex5.c.html">src/ksp/ksp/examples/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex9.c.html">src/ksp/ksp/examples/tutorials/ex9.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex42.c.html">src/ksp/ksp/examples/tutorials/ex42.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex43.c.html">src/ksp/ksp/examples/tutorials/ex43.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex49.c.html">src/ksp/ksp/examples/tutorials/ex49.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex67.c.html">src/ksp/ksp/examples/tutorials/ex67.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex70.c.html">src/ksp/ksp/examples/tutorials/ex70.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex48.c.html">src/snes/examples/tutorials/ex48.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex58.c.html">src/snes/examples/tutorials/ex58.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex78.c.html">src/snes/examples/tutorials/ex78.c.html</A><BR>
<A HREF="../../../src/ts/examples/tutorials/ex10.c.html">src/ts/examples/tutorials/ex10.c.html</A><BR>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/dm/impls/da/hypre/mhyp.c.html#MatZeroEntries_HYPREStruct_3d">MatZeroEntries_HYPREStruct_3d in src/dm/impls/da/hypre/mhyp.c</A><BR>
<A HREF="../../../src/dm/impls/da/hypre/mhyp.c.html#MatZeroEntries_HYPREStruct">MatZeroEntries_HYPREStruct in src/dm/impls/da/hypre/mhyp.c</A><BR>
<A HREF="../../../src/dm/impls/da/hypre/mhyp.c.html#MatZeroEntries_HYPRESStruct_3d">MatZeroEntries_HYPRESStruct_3d in src/dm/impls/da/hypre/mhyp.c</A><BR>
<A HREF="../../../src/dm/impls/da/hypre/mhyp.c.html#MatZeroEntries_HYPRESStruct">MatZeroEntries_HYPRESStruct in src/dm/impls/da/hypre/mhyp.c</A><BR>
<A HREF="../../../src/mat/impls/aij/mpi/mpiaij.c.html#MatZeroEntries_MPIAIJ">MatZeroEntries_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/aij.c.html#MatZeroEntries_SeqAIJ">MatZeroEntries_SeqAIJ in src/mat/impls/aij/seq/aij.c</A><BR>
<A HREF="../../../src/mat/impls/baij/mpi/mpibaij.c.html#MatZeroEntries_MPIBAIJ">MatZeroEntries_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c</A><BR>
<A HREF="../../../src/mat/impls/baij/seq/baij2.c.html#MatZeroEntries_SeqBAIJ">MatZeroEntries_SeqBAIJ in src/mat/impls/baij/seq/baij2.c</A><BR>
<A HREF="../../../src/mat/impls/dense/mpi/mpidense.c.html#MatZeroEntries_MPIDense">MatZeroEntries_MPIDense in src/mat/impls/dense/mpi/mpidense.c</A><BR>
<A HREF="../../../src/mat/impls/dense/seq/dense.c.html#MatZeroEntries_SeqDense">MatZeroEntries_SeqDense in src/mat/impls/dense/seq/dense.c</A><BR>
<A HREF="../../../src/mat/impls/elemental/matelem.cxx.html#MatZeroEntries_Elemental">MatZeroEntries_Elemental in src/mat/impls/elemental/matelem.cxx</A><BR>
<A HREF="../../../src/mat/impls/hypre/mhypre.c.html#MatZeroEntries_HYPRE_CSRMatrix">MatZeroEntries_HYPRE_CSRMatrix in src/mat/impls/hypre/mhypre.c</A><BR>
<A HREF="../../../src/mat/impls/hypre/mhypre.c.html#MatZeroEntries_HYPRE">MatZeroEntries_HYPRE in src/mat/impls/hypre/mhypre.c</A><BR>
<A HREF="../../../src/mat/impls/is/matis.c.html#MatZeroEntries_IS">MatZeroEntries_IS in src/mat/impls/is/matis.c</A><BR>
<A HREF="../../../src/mat/impls/nest/matnest.c.html#MatZeroEntries_Nest">MatZeroEntries_Nest in src/mat/impls/nest/matnest.c</A><BR>
<A HREF="../../../src/mat/impls/sbaij/mpi/mpisbaij.c.html#MatZeroEntries_MPISBAIJ">MatZeroEntries_MPISBAIJ in src/mat/impls/sbaij/mpi/mpisbaij.c</A><BR>
<A HREF="../../../src/mat/impls/sbaij/seq/sbaij2.c.html#MatZeroEntries_SeqSBAIJ">MatZeroEntries_SeqSBAIJ in src/mat/impls/sbaij/seq/sbaij2.c</A><BR>
<A HREF="../../../src/mat/impls/sell/mpi/mpisell.c.html#MatZeroEntries_MPISELL">MatZeroEntries_MPISELL in src/mat/impls/sell/mpi/mpisell.c</A><BR>
<A HREF="../../../src/mat/impls/sell/seq/sell.c.html#MatZeroEntries_SeqSELL">MatZeroEntries_SeqSELL in src/mat/impls/sell/seq/sell.c</A><BR>
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