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<div id="version" align=right><b>slepc-3.7.3 2016-09-29</b></div>
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<H1>BVSetOrthogonalization</H1>
Specifies the method used for the orthogonalization of vectors (classical or modified Gram-Schmidt with or without refinement), and for the block-orthogonalization (simultaneous orthogonalization of a set of vectors).
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcbv.h"
PetscErrorCode BVSetOrthogonalization(BV bv,BVOrthogType type,BVOrthogRefineType refine,PetscReal eta,BVOrthogBlockType block)
</PRE>
Logically Collective on <A HREF="../BV/BV.html#BV">BV</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>bv </B></TD><TD> - the basis vectors context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>type </B></TD><TD> - the method of vector orthogonalization
</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>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>block </B></TD><TD> - the method of block orthogonalization
</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>-bv_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>-bv_orthog_refine <ref> </B></TD><TD> - Where <ref> is one of never, ifneeded (default) or always
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-bv_orthog_eta <eta> </B></TD><TD> - For setting the value of eta
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-bv_orthog_block <block> </B></TD><TD> - Where <block> is the block-orthogonalization method
</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>
If the method set for block orthogonalization is GS, then the computation
is done column by column with the vector orthogonalization.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVOrthogonalizeColumn.html#BVOrthogonalizeColumn">BVOrthogonalizeColumn</A>(), <A HREF="../BV/BVGetOrthogonalization.html#BVGetOrthogonalization">BVGetOrthogonalization</A>(), <A HREF="../BV/BVOrthogType.html#BVOrthogType">BVOrthogType</A>, <A HREF="../BV/BVOrthogRefineType.html#BVOrthogRefineType">BVOrthogRefineType</A>, <A HREF="../BV/BVOrthogBlockType.html#BVOrthogBlockType">BVOrthogBlockType</A>
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/sys/classes/bv/interface/bvbasic.c.html#BVSetOrthogonalization">src/sys/classes/bv/interface/bvbasic.c</A>
<BR><A HREF="./index.html">Index of all BV routines</A>
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