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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</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-3.14.5 v3.14.5 docs/manualpages/KSP/KSPCheckNorm.html "><small>Report Typos and Errors</small></a></div>
<A NAME="KSPCheckNorm"><H1>KSPCheckNorm</H1></A>
Checks if the result of a norm used by the corresponding <A HREF="../KSP/KSP.html#KSP">KSP</A> contains Inf or NaN. These indicate that the previous application of the preconditioner generated an error Collective on ksp
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
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<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ksp </B></TD><TD>- the linear solver (<A HREF="../KSP/KSP.html#KSP">KSP</A>) context.
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<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
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<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>beta </B></TD><TD>- the result of the norm
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<H3><FONT COLOR="#CC3333">Developer Note</FONT></H3>
this is used to manage returning from <A HREF="../KSP/KSP.html#KSP">KSP</A> solvers whose preconditioners have failed in some way
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>(), <A HREF="../KSP/KSPSetType.html#KSPSetType">KSPSetType</A>(), <A HREF="../KSP/KSP.html#KSP">KSP</A>, <A HREF="../Sys/KSPCheckDot.html#KSPCheckDot">KSPCheckDot</A>(), <A HREF="../KSP/KSPCheckSolve.html#KSPCheckSolve">KSPCheckSolve</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/ksp/guess/../../../../include/petsc/private/kspimpl.h.html#KSPCheckNorm">src/ksp/ksp/guess/../../../../include/petsc/private/kspimpl.h</A>
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