Contents
dcoomm - coordinate matrix-matrix multiply
SUBROUTINE DCOOMM( TRANSA, M, N, K, ALPHA, DESCRA,
* VAL, INDX, JNDX, NNZ,
* B, LDB, BETA, C, LDC, WORK, LWORK)
INTEGER TRANSA, M, N, K, DESCRA(5), NNZ
* LDB, LDC, LWORK
INTEGER INDX(NNZ), JNDX(NNZ)
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
SUBROUTINE DCOOMM_64( TRANSA, M, N, K, ALPHA, DESCRA,
* VAL, INDX, JNDX, NNZ,
* B, LDB, BETA, C, LDC, WORK, LWORK)
INTEGER*8 TRANSA, M, N, K, DESCRA(5), NNZ
* LDB, LDC, LWORK
INTEGER*8 INDX(NNZ), JNDX(NNZ)
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION VAL(NNZ), B(LDB,*), C(LDC,*), WORK(LWORK)
F95 INTERFACE
SUBROUTINE COOMM( TRANSA, M, [N], K, ALPHA, DESCRA,
* VAL, INDX, JNDX, NNZ, B, [LDB], BETA, C, [LDC],
* [WORK], [LWORK] )
INTEGER TRANSA, M, K, NNZ
INTEGER, DIMENSION(:) :: DESCRA, INDX, JNDX
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION, DIMENSION(:) :: VAL
DOUBLE PRECISION, DIMENSION(:, :) :: B, C
SUBROUTINE COOMM_64( TRANSA, M, [N], K, ALPHA, DESCRA,
* VAL, INDX, JNDX, NNZ, B, [LDB], BETA, C, [LDC],
* [WORK], [LWORK] )
INTEGER*8 TRANSA, M, K, NNZ
INTEGER*8, DIMENSION(:) :: DESCRA, INDX, JNDX
DOUBLE PRECISION ALPHA, BETA
DOUBLE PRECISION, DIMENSION(:) :: VAL
DOUBLE PRECISION, DIMENSION(:, :) :: B, C
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:
http://math.nist.gov/mcsd/Staff/KRemington/fspblas/
"Document for the Basic Linear Algebra Subprograms (BLAS)
Standard", University of Tennessee, Knoxville, Tennessee,
1996:
http://www.netlib.org/utk/papers/sparse.ps