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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="MatLMVMUpdate"><H1>MatLMVMUpdate</H1></A>
Adds (X-Xprev) and (F-Fprev) updates to an LMVM matrix. The first time the function is called for an LMVM matrix, no update is applied, but the given X and F vectors are stored for use as Xprev and Fprev in the next update.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../KSP/MatLMVMUpdate.html#MatLMVMUpdate">MatLMVMUpdate</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> B, <A HREF="../Vec/Vec.html#Vec">Vec</A> X, <A HREF="../Vec/Vec.html#Vec">Vec</A> F)
</PRE>
If the user has provided another LMVM matrix in place of J0, the J0
matrix is also updated recursively.
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- An LMVM-type matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>X </B></TD><TD>- Solution vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>F </B></TD><TD>- Function vector
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/MatLMVMReset.html#MatLMVMReset">MatLMVMReset</A>(), <A HREF="../KSP/MatLMVMAllocate.html#MatLMVMAllocate">MatLMVMAllocate</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/ksp/ksp/utils/lmvm/lmvmutils.c.html#MatLMVMUpdate">src/ksp/ksp/utils/lmvm/lmvmutils.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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