slepc-main 2024-11-15

BVMultVec

Computes y = beta*y + alpha*X*q.

Synopsis

#include "slepcbv.h" 
PetscErrorCode BVMultVec(BV X,PetscScalar alpha,PetscScalar beta,Vec y,PetscScalar q[])

Logically Collective

Input Parameters

	X	- a basis vectors object
	alpha	- first scalar
	beta	- second scalar
	y	- a vector (modified on output)
	q	- an array of scalars

Notes

This operation is the analogue of BVMult() but with a BV and a Vec, instead of two BV. Note that arguments are listed in different order with respect to BVMult().

If X has leading columns specified, then these columns do not participate in the computation.

The length of array q must be equal to the number of active columns of X minus the number of leading columns, i.e. the first entry of q multiplies the first non-leading column.

Level

intermediate

Location