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<div id="version" align=right><b>slepc-3.7.3 2016-09-29</b></div>
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<H1>BVMult</H1>
Computes Y = beta*Y + alpha*X*Q.
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcbv.h"
PetscErrorCode BVMult(BV Y,PetscScalar alpha,PetscScalar beta,BV X,Mat 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>Y,X </B></TD><TD> - basis vectors
</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>Q </B></TD><TD> - (optional) sequential dense matrix
</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>Y </B></TD><TD> - the modified basis vectors
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
X and Y must be different objects. The case X=Y can be addressed with
<A HREF="../BV/BVMultInPlace.html#BVMultInPlace">BVMultInPlace</A>().
<P>
If matrix Q is NULL, then an AXPY operation Y = beta*Y + alpha*X is done
(i.e. results as if Q = identity). If provided,
the matrix Q must be a sequential dense Mat, with all entries equal on
all processes (otherwise each process will compute a different update).
The dimensions of Q must be at least m,n where m is the number of active
columns of X and n is the number of active columns of Y.
<P>
The leading columns of Y are not modified. Also, if X has leading
columns specified, then these columns do not participate in the computation.
Hence, only rows (resp. columns) of Q starting from lx (resp. ly) are used,
where lx (resp. ly) is the number of leading columns of X (resp. Y).
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVMultVec.html#BVMultVec">BVMultVec</A>(), <A HREF="../BV/BVMultColumn.html#BVMultColumn">BVMultColumn</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#BVMult">src/sys/classes/bv/interface/bvops.c</A>
<BR><A HREF="./index.html">Index of all BV routines</A>
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