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<TITLE>KSPCGSetType</TITLE>
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<A NAME="KSPCGSetType"><H1>KSPCGSetType</H1></A>
Sets the variant of the conjugate gradient method to use for solving a linear system with a complex coefficient matrix. This option is irrelevant when solving a real system.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PETSCKSP_DLLEXPORT KSPCGSetType(KSP ksp,KSPCGType type)
</PRE>
Collective on <A HREF="../KSP/KSP.html#KSP">KSP</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>ksp </B></TD><TD>- the iterative context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>type </B></TD><TD>- the variant of CG to use, one of
</TD></TR></TABLE>
<PRE>
KSP_CG_HERMITIAN - complex, Hermitian matrix (default)
KSP_CG_SYMMETRIC - complex, symmetric matrix
</PRE>
<P>
<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>-ksp_cg_Hermitian </B></TD><TD>- Indicates Hermitian matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-ksp_cg_symmetric </B></TD><TD>- Indicates symmetric matrix
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
By default, the matrix is assumed to be complex, Hermitian.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
CG, conjugate gradient, Hermitian, symmetric, set, type
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/impls/cg/cgtype.c.html#KSPCGSetType">src/ksp/ksp/impls/cg/cgtype.c</A>
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