NAME

BStri_mult - Multiply the matrix (A - shift*B) by a block of vectors

INPUT PARAMETERS

A

- a sparse matrix

comm_A

- the communication structure for A

B

- a sparse matrix

comm_B

- the communication structure for B

v1

- the block of vectors to multiply by

t1

- a block of work vectors

t2

- a block of work vectors

shift

- the shift value in (A-shift*B)

BS

- the number of vectors in v1

procinfo

- the usual processor stuff

OUTPUT PARAMETERS

v2

- the resulting block of vectors

RETURNS

void

NOTES

Different code is used to multiply a single vector than is used to multiply a block of vectors (this improves efficiency). Also different code is used if shift=0.0. If B is NULL, then we assume that it is the identity matrix.

SYNOPSIS

void BStri_mult(BSpar_mat *A, BScomm *comm_A, BSpar_mat *B, BScomm *comm_B,


 FLOAT *v1, FLOAT *v2, FLOAT *t1, FLOAT *t2, FLOAT shift, int BS,


 BSprocinfo *procinfo)

LOCATION

BlockSolve95/src/BStri_mult.c