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BStri_mult(3)                    BlockSolve95                    BStri_mult(3)

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

                                   4/4/1996                      BStri_mult(3)