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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="MatMFFDCheckPositivity"><H1>MatMFFDCheckPositivity</H1></A>
Checks that all entries in U + h*a are positive or zero, decreases h until this is satisfied.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatMFFDCheckPositivity.html#MatMFFDCheckPositivity">MatMFFDCheckPositivity</A>(void *dummy,<A HREF="../Vec/Vec.html#Vec">Vec</A> U,<A HREF="../Vec/Vec.html#Vec">Vec</A> a,<A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A> *h)
</PRE>
Logically Collective on <A HREF="../Vec/Vec.html#Vec">Vec</A>
<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>U </B></TD><TD>- base vector that is added to
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>a </B></TD><TD>- vector that is added
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>h </B></TD><TD>- scaling factor on a
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dummy </B></TD><TD>- context variable (unused)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_mffd_check_positivity</B></TD></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This is rarely used directly, rather it is passed as an argument to
<A HREF="../Mat/MatMFFDSetCheckh.html#MatMFFDSetCheckh">MatMFFDSetCheckh</A>()
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatMFFDSetCheckh.html#MatMFFDSetCheckh">MatMFFDSetCheckh</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/mat/impls/mffd/mffd.c.html#MatMFFDCheckPositivity">src/mat/impls/mffd/mffd.c</A>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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