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<H1>IPSetOrthogonalization</H1>
Specifies the type of orthogonalization technique to be used (classical or modified Gram-Schmidt with or without refinement).
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcip.h"
PetscErrorCode IPSetOrthogonalization(IP ip,IPOrthogType type,IPOrthogRefineType refine,PetscReal eta)
</PRE>
Logically Collective on <A HREF="../IP/IP.html#IP">IP</A>
<P>
<H3><FONT COLOR="#883300">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ip </B></TD><TD> - the inner product context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>type </B></TD><TD> - the type of orthogonalization technique
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>refine </B></TD><TD> - type of refinement
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>eta </B></TD><TD> - parameter for selective refinement
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-orthog_type <type> </B></TD><TD> - Where <type> is cgs for Classical Gram-Schmidt orthogonalization
(default) or mgs for Modified Gram-Schmidt orthogonalization
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-orthog_refine <type> </B></TD><TD> - Where <type> is one of never, ifneeded (default) or always
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-orthog_eta <eta> </B></TD><TD> - For setting the value of eta
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The default settings work well for most problems.
<P>
The parameter eta should be a real value between 0 and 1 (or PETSC_DEFAULT).
The value of eta is used only when the refinement type is "ifneeded".
<P>
When using several processors, MGS is likely to result in bad scalability.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../IP/IPOrthogonalize.html#IPOrthogonalize">IPOrthogonalize</A>(), <A HREF="../IP/IPGetOrthogonalization.html#IPGetOrthogonalization">IPGetOrthogonalization</A>(), <A HREF="../IP/IPOrthogType.html#IPOrthogType">IPOrthogType</A>,
<BR><A HREF="../IP/IPOrthogRefineType.html#IPOrthogRefineType">IPOrthogRefineType</A>
<P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/ip/ipbasic.c.html#IPSetOrthogonalization">src/ip/ipbasic.c</A>
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