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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="KSPComputeExplicitOperator"><H1>KSPComputeExplicitOperator</H1></A>
Computes the explicit preconditioned operator, including diagonal scaling and null space removal if applicable.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode KSPComputeExplicitOperator(KSP ksp,Mat *mat)
</PRE>
Collective on <A HREF="../KSP/KSP.html#KSP">KSP</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>ksp </B> -the Krylov subspace context
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>mat </B> -the explict preconditioned operator
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This computation is done by applying the operators to columns of the
identity matrix.
<P>
Currently, this routine uses a dense matrix format when 1 processor
is used and a sparse format otherwise. This routine is costly in general,
and is recommended for use only with relatively small systems.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../KSP/KSP.html#KSP">KSP</A>, compute, explicit, operator
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPComputeEigenvaluesExplicitly.html#KSPComputeEigenvaluesExplicitly">KSPComputeEigenvaluesExplicitly</A>(), <A HREF="../PC/PCComputeExplicitOperator.html#PCComputeExplicitOperator">PCComputeExplicitOperator</A>(), <A HREF="../KSP/KSPSetDiagonalScale.html#KSPSetDiagonalScale">KSPSetDiagonalScale</A>(), KSPSetNullSpace()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/interface/eige.c.html#KSPComputeExplicitOperator">src/ksp/ksp/interface/eige.c</A>
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