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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>BVMatMult</H1>
Computes the matrix-vector product for each column, Y=A*V.
<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/BVMatMult.html#BVMatMult">BVMatMult</A>(<A HREF="../BV/BV.html#BV">BV</A> V,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> A,<A HREF="../BV/BV.html#BV">BV</A> Y)
</PRE>
Neighbor-wise 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>V </B></TD><TD> - basis vectors context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD> - the 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 result
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
Both V and Y must be distributed in the same manner. Only active columns
(excluding the leading ones) are processed.
In the result Y, columns are overwritten starting from the leading ones.
The number of active columns in V and Y should match, although they need
not be the same columns.
<P>
It is possible to choose whether the computation is done column by column
or as a <A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A>-<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> product, see <A HREF="../BV/BVSetMatMultMethod.html#BVSetMatMultMethod">BVSetMatMultMethod</A>().
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVCopy.html#BVCopy">BVCopy</A>(), <A HREF="../BV/BVSetActiveColumns.html#BVSetActiveColumns">BVSetActiveColumns</A>(), <A HREF="../BV/BVMatMultColumn.html#BVMatMultColumn">BVMatMultColumn</A>(), <A HREF="../BV/BVMatMultTranspose.html#BVMatMultTranspose">BVMatMultTranspose</A>(), <A HREF="../BV/BVMatMultHermitianTranspose.html#BVMatMultHermitianTranspose">BVMatMultHermitianTranspose</A>(), <A HREF="../BV/BVSetMatMultMethod.html#BVSetMatMultMethod">BVSetMatMultMethod</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/bvops.c.html#BVMatMult">src/sys/classes/bv/interface/bvops.c</A>
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