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<TITLE>KSPGetResidualHistory</TITLE>
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<A NAME="KSPGetResidualHistory"><H1>KSPGetResidualHistory</H1></A>
Gets the array used to hold the residual history and the number of residuals it contains.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PETSCKSP_DLLEXPORT KSPGetResidualHistory(KSP ksp,PetscReal *a[],PetscInt *na)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>ksp </B> -iterative context obtained from <A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>()
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>a </B></TD><TD>- pointer to array to hold history (or <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>na </B></TD><TD>- number of used entries in a (or <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Can only be called after a <A HREF="../KSP/KSPSetResidualHistory.html#KSPSetResidualHistory">KSPSetResidualHistory</A>() otherwise a and na are set to zero
<P>
The Fortran version of this routine has a calling sequence
<pre>
call <A HREF="../KSP/KSPGetResidualHistory.html#KSPGetResidualHistory">KSPGetResidualHistory</A>(<A HREF="../KSP/KSP.html#KSP">KSP</A> ksp, integer na, integer ierr)
</pre>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../KSP/KSP.html#KSP">KSP</A>, get, residual, history, norm
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPGetResidualHistory.html#KSPGetResidualHistory">KSPGetResidualHistory</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/interface/itfunc.c.html#KSPGetResidualHistory">src/ksp/ksp/interface/itfunc.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/examples/tutorials/ex6.c.html">src/snes/examples/tutorials/ex6.c.html</A><BR>
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