coomm, scoomm, dcoomm, ccoomm, zcoomm - coordinate matrix-matrix multiply
SUBROUTINE SCOOMM( TRANSA, M, N, K, ALPHA, DESCRA, * VAL, INDX, JNDX, NNZ, * B, LDB, BETA, C, LDC, WORK, LWORK ) INTEGER*4 TRANSA, M, N, K, DESCRA(5), NNZ * LDB, LDC, LWORK INTEGER*4 INDX(NNZ), JNDX(NNZ) REAL*4 ALPHA, BETA REAL*4 VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
SUBROUTINE DCOOMM( TRANSA, M, N, K, ALPHA, DESCRA, * VAL, INDX, JNDX, NNZ, * B, LDB, BETA, C, LDC, WORK, LWORK) INTEGER*4 TRANSA, M, N, K, DESCRA(5), NNZ * LDB, LDC, LWORK INTEGER*4 INDX(NNZ), JNDX(NNZ) REAL*8 ALPHA, BETA REAL*8 VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
SUBROUTINE CCOOMM( TRANSA, M, N, K, ALPHA, DESCRA, * VAL, INDX, JNDX, NNZ, * B, LDB, BETA, C, LDC, WORK, LWORK ) INTEGER*4 TRANSA, M, N, K, DESCRA(5), NNZ * LDB, LDC, LWORK INTEGER*4 INDX(NNZ), JNDX(NNZ) COMPLEX*8 ALPHA, BETA COMPLEX*8 VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
SUBROUTINE ZCOOMM( TRANSA, M, N, K, ALPHA, DESCRA, * VAL, INDX, JNDX, NNZ, * B, LDB, BETA, C, LDC, WORK, LWORK) INTEGER*4 TRANSA, M, N, K, DESCRA(5), NNZ * LDB, LDC, LWORK INTEGER*4 INDX(NNZ), JNDX(NNZ) COMPLEX*16 ALPHA, BETA COMPLEX*16 VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
C <- alpha op(A) B + beta C
where ALPHA and BETA are scalar, C and B are dense matrices, A is a matrix represented in coordinate format and op( A ) is one of
op( A ) = A or op( A ) = A' or op( A ) = conjg( A' ). ( ' indicates matrix transpose)
TRANSA Indicates how to operate with the sparse matrix 0 : operate with matrix 1 : operate with transpose matrix 2 : operate with the conjugate transpose of matrix. 2 is equivalent to 1 if matrix is real.
M Number of rows in matrix A
N Number of columns in matrix C
K Number of columns in matrix A
ALPHA Scalar parameter
DESCRA() Descriptor argument. Five element integer array DESCRA(1) matrix structure 0 : general 1 : symmetric (A=A') 2 : Hermitian (A= CONJG(A')) 3 : Triangular 4 : Skew(Anti)-Symmetric (A=-A') 5 : Diagonal 6 : Skew-Hermitian (A= -CONJG(A')) DESCRA(2) upper/lower triangular indicator 1 : lower 2 : upper DESCRA(3) main diagonal type 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 consisting of the non-zero entries of A, in any order.
INDX() integer array of length NNZ consisting of the corresponding row indices of the entries of A.
JNDX() integer array of length NNZ consisting of the corresponding column indices of the entries of A.
NNZ number of non-zero elements in 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. WORK is not referenced in the current version.
LWORK length of WORK array. LWORK is not referenced in the current version.
NIST FORTRAN Sparse Blas User's Guide available at: