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<H1>DSSetRefined</H1>
Sets a flag to indicate that refined vectors must be computed.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcds.h"
PetscErrorCode DSSetRefined(DS ds,PetscBool ref)
</PRE>
Logically Collective on <A HREF="../DS/DS.html#DS">DS</A>
<P>
<H3><FONT COLOR="#883300">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ds </B></TD><TD> - the direct solver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ref </B></TD><TD> - a boolean flag
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Normally the vectors returned in DS_MAT_X are eigenvectors of the
projected matrix. With this flag activated, <A HREF="../DS/DSVectors.html#DSVectors">DSVectors</A>() will return
the right singular vector of the smallest singular value of matrix
\tilde{A}-theta*I, where \tilde{A} is the extended (n+1)xn matrix
and theta is the Ritz value. This is used in the refined Ritz
approximation.
<P>
The default is PETSC_FALSE.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../DS/DSVectors.html#DSVectors">DSVectors</A>(), <A HREF="../DS/DSGetRefined.html#DSGetRefined">DSGetRefined</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/ds/interface/dsbasic.c.html#DSSetRefined">src/ds/interface/dsbasic.c</A>
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