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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>BVGetColumn</H1>
Returns a <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> object that contains the entries of the requested column of the basis vectors object.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcbv.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../BV/BVGetColumn.html#BVGetColumn">BVGetColumn</A>(<A HREF="../BV/BV.html#BV">BV</A> bv,<A HREF="https://petsc.org/release/manualpages/Sys/PetscInt.html#PetscInt">PetscInt</A> j,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> *v)
</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>bv </B></TD><TD> - the basis vectors context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>j </B></TD><TD> - the index of the requested column
</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>v </B></TD><TD> - vector containing the jth column
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
The returned <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> must be seen as a reference (not a copy) of the <A HREF="../BV/BV.html#BV">BV</A>
column, that is, modifying the <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> will change the <A HREF="../BV/BV.html#BV">BV</A> entries as well.
<P>
The returned <A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> must not be destroyed. <A HREF="../BV/BVRestoreColumn.html#BVRestoreColumn">BVRestoreColumn</A>() must be
called when it is no longer needed. At most, two columns can be fetched,
that is, this function can only be called twice before the corresponding
<A HREF="../BV/BVRestoreColumn.html#BVRestoreColumn">BVRestoreColumn</A>() is invoked.
<P>
A negative index j selects the i-th constraint, where i=-j. Constraints
should not be modified.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVRestoreColumn.html#BVRestoreColumn">BVRestoreColumn</A>(), <A HREF="../BV/BVInsertConstraints.html#BVInsertConstraints">BVInsertConstraints</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/sys/classes/bv/interface/bvbasic.c.html#BVGetColumn">src/sys/classes/bv/interface/bvbasic.c</A>
<BR><BR><A HREF="./index.html">Index of all BV routines</A>
<BR><A HREF="../../../docs/manual.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
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