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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</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-3.7.5 v3.7.5 docs/manualpages/KSP/KSPSetComputeOperators.html "><small>Report Typos and Errors</small></a></div>
<A NAME="KSPSetComputeOperators"><H1>KSPSetComputeOperators</H1></A>
set routine to compute the linear operators
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode KSPSetComputeOperators(KSP ksp,PetscErrorCode (*func)(KSP,Mat,Mat,void*),void *ctx)
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ksp </B></TD><TD>- the <A HREF="../KSP/KSP.html#KSP">KSP</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>func </B></TD><TD>- function to compute the operators
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- optional context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling sequence of func</FONT></H3>
<pre>
func(<A HREF="../KSP/KSP.html#KSP">KSP</A> ksp,<A HREF="../Mat/Mat.html#Mat">Mat</A> A,<A HREF="../Mat/Mat.html#Mat">Mat</A> B,void *ctx)
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ksp </B></TD><TD>- the <A HREF="../KSP/KSP.html#KSP">KSP</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD>- the linear operator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- preconditioning matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- optional user-provided context
</TD></TR></TABLE>
<P>
Notes: The user provided func() will be called automatically at the very next call to <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>(). It will not be called at future <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>() calls
unless either <A HREF="../KSP/KSPSetComputeOperators.html#KSPSetComputeOperators">KSPSetComputeOperators</A>() or <A HREF="../KSP/KSPSetOperators.html#KSPSetOperators">KSPSetOperators</A>() is called before that <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>() is called.
<P>
To reuse the same preconditioner for the next <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>() and not compute a new one based on the most recently computed matrix call <A HREF="../KSP/KSPSetReusePreconditioner.html#KSPSetReusePreconditioner">KSPSetReusePreconditioner</A>()
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPSetOperators.html#KSPSetOperators">KSPSetOperators</A>(), <A HREF="../KSP/KSPSetComputeRHS.html#KSPSetComputeRHS">KSPSetComputeRHS</A>(), <A HREF="../KSP/DMKSPSetComputeOperators.html#DMKSPSetComputeOperators">DMKSPSetComputeOperators</A>(), <A HREF="../KSP/KSPSetComputeInitialGuess.html#KSPSetComputeInitialGuess">KSPSetComputeInitialGuess</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/interface/itfunc.c.html#KSPSetComputeOperators">src/ksp/ksp/interface/itfunc.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex25.c.html">src/ksp/ksp/examples/tutorials/ex25.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex28.c.html">src/ksp/ksp/examples/tutorials/ex28.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex29.c.html">src/ksp/ksp/examples/tutorials/ex29.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex31.c.html">src/ksp/ksp/examples/tutorials/ex31.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex32.c.html">src/ksp/ksp/examples/tutorials/ex32.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex34.c.html">src/ksp/ksp/examples/tutorials/ex34.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex45.c.html">src/ksp/ksp/examples/tutorials/ex45.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex50.c.html">src/ksp/ksp/examples/tutorials/ex50.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex65.c.html">src/ksp/ksp/examples/tutorials/ex65.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex22f.F.html">src/ksp/ksp/examples/tutorials/ex22f.F.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex45f.F.html">src/ksp/ksp/examples/tutorials/ex45f.F.html</A><BR>
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