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<div id="version" align=right><b>slepc-3.7.3 2016-09-29</b></div>
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<H1>BVMultColumn</H1>
Computes y = beta*y + alpha*X*q, where y is the j-th column of X.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcbv.h"
PetscErrorCode BVMultColumn(BV X,PetscScalar alpha,PetscScalar beta,PetscInt j,PetscScalar *q)
</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>X </B></TD><TD> - a basis vectors object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>alpha,beta </B></TD><TD> - scalars
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>j </B></TD><TD> - the column index
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>q </B></TD><TD> - an array of scalars
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
This operation is equivalent to <A HREF="../BV/BVMultVec.html#BVMultVec">BVMultVec</A>() but it uses column j of X
rather than taking a Vec as an argument. The number of active columns of
X is set to j before the computation, and restored afterwards.
If X has leading columns specified, then these columns do not participate
in the computation. Therefore, the length of array q must be equal to j
minus the number of leading columns.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVMult.html#BVMult">BVMult</A>(), <A HREF="../BV/BVMultVec.html#BVMultVec">BVMultVec</A>(), <A HREF="../BV/BVMultInPlace.html#BVMultInPlace">BVMultInPlace</A>(), <A HREF="../BV/BVSetActiveColumns.html#BVSetActiveColumns">BVSetActiveColumns</A>()
<BR><P><B><FONT COLOR="#883300">Location: </FONT></B><A HREF="../../../src/sys/classes/bv/interface/bvops.c.html#BVMultColumn">src/sys/classes/bv/interface/bvops.c</A>
<BR><A HREF="./index.html">Index of all BV routines</A>
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