SUBROUTINE SBSCMM( TRANSA, MB, N, KB, ALPHA, DESCRA, * VAL, BINDX, BPNTRB, BPNTRE, LB, * B, LDB, BETA, C, LDC, WORK, LWORK ) INTEGER*4 TRANSA, MB, N, KB, DESCRA(5), LB, * LDB, LDC, LWORK INTEGER*4 BINDX(BNNZ), BPNTRB(KB), BPNTRE(KB) REAL*4 ALPHA, BETA REAL*4 VAL(LB*LB*BNNZ), B(LDB,*), C(LDC,*), WORK(LWORK) SUBROUTINE DBSCMM( TRANSA, MB, N, KB, ALPHA, DESCRA, * VAL, BINDX, BPNTRB, BPNTRE, LB, * B, LDB, BETA, C, LDC, WORK, LWORK) INTEGER*4 TRANSA, MB, N, KB, DESCRA(5), LB, * LDB, LDC, LWORK INTEGER*4 BINDX(BNNZ), BPNTRB(KB), BPNTRE(KB) REAL*8 ALPHA, BETA REAL*8 VAL(LB*LB*BNNZ), B(LDB,*), C(LDC,*), WORK(LWORK) where: BNNZ = BPNTRE(KB)-BPNTRB(1)
C <- alpha A B + beta C C <- alpha A'B + beta C ( ' indicates matrix transpose)
TRANSA Indicates how to operate with the sparse matrix 0 : operate with matrix 1 : operate with transpose matrix MB Number of block rows in matrix A N Number of columns in matrix C KB Number of block columns in matrix A ALPHA Scalar parameter DESCRA() Descriptor argument. Five element integer array DESCRA(1) matrix structure 0 : general 1 : symmetric 2 : Hermitian 3 : Triangular 4 : Skew(Anti)-Symmetric 5 : Diagonal DESCRA(2) upper/lower triangular indicator (NOT IMPLEMENTED) 1 : lower 2 : upper DESCRA(3) main diagonal type (NOT IMPLEMENTED) 0 : non-unit 1 : unit DESCRA(4) Array base (NOT IMPLEMENTED) 0 : C/C++ compatible 1 : Fortran compatible DESCRA(5) repeated indices? (NOT IMPLEMENTED) 0 : unknown 1 : no repeated indices VAL() scalar array of length NNZ containing matrix entries stored column-major within each dense block. BINDX() integer array of length BNNZ consisting of the block row indices of the block entries of A. BPNTRB() integer array of length KB such that BPNTRB(J)-BPNTRB(1)+1 points to location in BINDX of the first block entry of the J-th block column of A. BPNTRE() integer array of length KB such that BPNTRE(J)-BPNTRE(1)+1 points to location in BINDX of the last block entry of the J-th block column of A. LB dimension of dense blocks composing A. B() rectangular array with first dimension LDB. LDB leading dimension of B BETA Scalar parameter C() rectangular array with first dimension LDC. LDC leading dimension of C WORK() scratch array of length LWORK. LWORK should be at least MAX(MB*LB*LB,N). LWORK length of WORK array
http://math.nist.gov/mcsd/Staff/KRemington/fspblas/