BVDotVec#

Computes multiple dot products of a vector against all the column vectors of a BV.

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVDotVec(BV X,Vec y,PetscScalar m[])

Collective

Input Parameters#

X - basis vectors
y - a vector

Output Parameter#

m - an array where the result must be placed

Notes#

This is analogue to VecMDot(), but using BV to represent a collection of vectors. The result is \(m = X^*y\), so \(m_i\) is equal to \(x_i^* y\). Note that here X is transposed as opposed to BVDot().

If a non-standard inner product has been specified with BVSetMatrix(), then the result is \(m = X^*By\).

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.