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<div id="version" align=right><b>slepc-3.23.1 2025-05-01</b></div>
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<H1>BVDotVec</H1>
Computes multiple dot products of a vector against all the column vectors of a <A HREF="../BV/BV.html#BV">BV</A>.
<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/BVDotVec.html#BVDotVec">BVDotVec</A>(<A HREF="../BV/BV.html#BV">BV</A> X,<A HREF="https://petsc.org/release/manualpages/Vec/Vec.html#Vec">Vec</A> y,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> m[])
</PRE>
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>X </B></TD><TD> - basis vectors
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>y </B></TD><TD> - a vector
</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>m </B></TD><TD> - an array where the result must be placed
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
This is analogue to <A HREF="https://petsc.org/release/manualpages/Vec/VecMDot.html#VecMDot">VecMDot</A>(), but using <A HREF="../BV/BV.html#BV">BV</A> to represent a collection
of vectors. The result is m = X^H*y, so m_i is equal to x_i^H y. Note
that here X is transposed as opposed to <A HREF="../BV/BVDot.html#BVDot">BVDot</A>().
<P>
If a non-standard inner product has been specified with <A HREF="../BV/BVSetMatrix.html#BVSetMatrix">BVSetMatrix</A>(),
then the result is m = X^H*B*y.
<P>
The length of array m must be equal to the number of active columns of X
minus the number of leading columns, i.e. the first entry of m is the
product of the first non-leading column with y.
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="../BV/BVDot.html#BVDot">BVDot</A>(), <A HREF="../BV/BVDotColumn.html#BVDotColumn">BVDotColumn</A>(), <A HREF="../BV/BVSetActiveColumns.html#BVSetActiveColumns">BVSetActiveColumns</A>(), <A HREF="../BV/BVSetMatrix.html#BVSetMatrix">BVSetMatrix</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/sys/classes/bv/interface/bvglobal.c.html#BVDotVec">src/sys/classes/bv/interface/bvglobal.c</A>
<BR><BR><A HREF="./index.html">Index of all BV routines</A>
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