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<TITLE>MatSNESMFGetReuseBase</TITLE>
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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="MatSNESMFGetReuseBase"><H1>MatSNESMFGetReuseBase</H1></A>
Determines if the base vector is to be used for differencing even if the function provided to <A HREF="../SNES/SNESSetFunction.html#SNESSetFunction">SNESSetFunction</A>() is not the same as that provided to <A HREF="../Mat/MatMFFDSetFunction.html#MatMFFDSetFunction">MatMFFDSetFunction</A>().
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
#include "petscdm.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../SNES/MatSNESMFGetReuseBase.html#MatSNESMFGetReuseBase">MatSNESMFGetReuseBase</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> J,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *use)
</PRE>
Logically Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>J </B> -the <A HREF="../Mat/MatMFFD.html#MatMFFD">MatMFFD</A> matrix
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>use </B> -if true always reuse the base vector instead of recomputing f(u) even if the function in the MatSNESMF is
not <A HREF="../SNES/SNESComputeFunction.html#SNESComputeFunction">SNESComputeFunction</A>()
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Care must be taken when using this routine to insure that the function provided to <A HREF="../Mat/MatMFFDSetFunction.html#MatMFFDSetFunction">MatMFFDSetFunction</A>(), call it F_MF() is compatible with
with that provided to <A HREF="../SNES/SNESSetFunction.html#SNESSetFunction">SNESSetFunction</A>(), call it F_SNES(). That is, (F_MF(u + h*d) - F_SNES(u))/h has to approximate the derivative
<P>
<H3><FONT COLOR="#CC3333">Developer Notes</FONT></H3>
This was provided for the MOOSE team who desired to have a <A HREF="../SNES/SNESSetFunction.html#SNESSetFunction">SNESSetFunction</A>() function that could change configurations due
to contacts while the function provided to <A HREF="../Mat/MatMFFDSetFunction.html#MatMFFDSetFunction">MatMFFDSetFunction</A>() cannot. Except for the possibility of changing the configuration
both functions compute the same mathematical function so the differencing makes sense.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>(), <A HREF="../SNES/MatSNESMFSetReuseBase.html#MatSNESMFSetReuseBase">MatSNESMFSetReuseBase</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/snes/mf/snesmfj.c.html#MatSNESMFGetReuseBase">src/snes/mf/snesmfj.c</A>
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