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<div id="version" align=right><b>slepc-3.22.2 2024-12-02</b></div>
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<H1>EPSSetPurify</H1>
Deactivate eigenvector purification (which is activated by default).
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepceps.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../EPS/EPSSetPurify.html#EPSSetPurify">EPSSetPurify</A>(<A HREF="../EPS/EPS.html#EPS">EPS</A> eps,<A HREF="https://petsc.org/release/manualpages/Sys/PetscBool.html#PetscBool">PetscBool</A> purify)
</PRE>
Logically Collective
<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>eps </B></TD><TD> - the eigensolver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>purify </B></TD><TD> - whether purification is required or not
</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>-eps_purify <boolean> </B></TD><TD> - Sets/resets the boolean flag 'purify'
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
By default, eigenvectors of generalized symmetric eigenproblems are purified
in order to purge directions in the nullspace of matrix B. If the user knows
that B is non-singular, then purification can be safely deactivated and some
computational cost is avoided (this is particularly important in interval computations).
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSGetPurify.html#EPSGetPurify">EPSGetPurify</A>(), <A HREF="../EPS/EPSSetInterval.html#EPSSetInterval">EPSSetInterval</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/eps/interface/epsopts.c.html#EPSSetPurify">src/eps/interface/epsopts.c</A>
<BR><BR><A HREF="./index.html">Index of all EPS routines</A>
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