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<A NAME="KSPGCRSetModifyPC"><H1>KSPGCRSetModifyPC</H1></A>
Sets the routine used by GCR to modify the preconditioner.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
PetscErrorCode PETSCKSP_DLLEXPORT KSPGCRSetModifyPC(KSP ksp,PetscErrorCode (*function)(KSP,PetscInt,PetscReal,void*),void *data,PetscErrorCode (*destroy)(void*))
</PRE>
Collective on <A HREF="../KSP/KSP.html#KSP">KSP</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
+ ksp - iterative context obtained from <A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>()
. function - user defined function to modify the preconditioner
. ctx - user provided contex for the modify preconditioner function
- destroy - the function to use to destroy the user provided application context.
<P>
<H3><FONT COLOR="#CC3333">Calling Sequence of function</FONT></H3>
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> function ( <A HREF="../KSP/KSP.html#KSP">KSP</A> ksp, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> n, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> rnorm, void *ctx )
<P>
ksp - iterative context
n - the total number of GCR iterations that have occurred
rnorm - 2-norm residual value
ctx - the user provided application context
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The default modifypc routine is KSPGCRModifyPCNoChange()
<P>
.seealso: KSPGCRModifyPCNoChange()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/impls/gcr/gcr.c.html#KSPGCRSetModifyPC">src/ksp/ksp/impls/gcr/gcr.c</A>
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