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<TITLE>EPSGetStartVectorLeft</TITLE>
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<H1>EPSGetStartVectorLeft</H1>
Gets a suitable vector to be used as the starting vector in the recurrence that builds the left subspace (in methods that work with two subspaces).
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepceps.h"
PetscErrorCode EPSGetStartVectorLeft(EPS eps,PetscInt i,Vec vec,PetscBool *breakdown)
</PRE>
Collective on <A HREF="../EPS/EPS.html#EPS">EPS</A> and Vec
<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>i </B></TD><TD> - iteration number
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vec </B></TD><TD> - the start vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>breakdown </B></TD><TD> - flag indicating that a breakdown has occurred
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The start vector is computed from another vector: for the first step (i=0),
the first left initial vector is used (see <A HREF="../EPS/EPSSetInitialSpaceLeft.html#EPSSetInitialSpaceLeft">EPSSetInitialSpaceLeft</A>()); otherwise
a random vector is created. Then this vector is forced to be in the range
of OP' and orthonormalized with respect to all W-vectors up to i-1.
<P>
The flag breakdown is set to true if i>0 and the vector is linearly dependent
with respect to the W-vectors.
<P>
The caller must pass a vector already allocated with dimensions conforming
to the left initial vector. This vector is overwritten.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../EPS/EPSSetInitialSpaceLeft.html#EPSSetInitialSpaceLeft">EPSSetInitialSpaceLeft</A>()
<BR>
<P>
<P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/eps/interface/solve.c.html#EPSGetStartVectorLeft">src/eps/interface/solve.c</A>
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