Visible to Intel only — GUID: GUID-C2EE93F0-B573-4538-A994-202CB3ADFFC2
Visible to Intel only — GUID: GUID-C2EE93F0-B573-4538-A994-202CB3ADFFC2
mkl_?cscmv
Computes matrix-vector product for a sparse matrix in the CSC format (deprecated).
Syntax
call mkl_scscmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
call mkl_dcscmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
call mkl_ccscmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
call mkl_zcscmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
Include Files
- mkl.fi
Description
This routine is deprecated. Use mkl_sparse_?_mvfrom the Intel® oneAPI Math Kernel Library (oneMKL) Inspector-executor Sparse BLAS interface instead.
The mkl_?cscmv routine performs a matrix-vector operation defined as
y := alpha*A*x + beta*y
or
y := alpha*AT*x + beta*y,
where:
alpha and beta are scalars,
x and y are vectors,
A is an m-by-k sparse matrix in compressed sparse column (CSC) format, AT is the transpose of A.
This routine supports CSC format both with one-based indexing and zero-based indexing.
Input Parameters
Parameter descriptions are common for all implemented interfaces with the exception of data types that refer here to the FORTRAN 77 standard types. Data types specific to the different interfaces are described in the section "Interfaces" below.
- transa
-
CHARACTER*1. Specifies the operation.
If transa = 'N' or 'n', then y := alpha*A*x + beta*y
If transa = 'T' or 't' or 'C' or 'c', then y := alpha*AT*x + beta*y,
- m
-
INTEGER. Number of rows of the matrix A.
- k
-
INTEGER. Number of columns of the matrix A.
- alpha
-
REAL for mkl_scscmv.
DOUBLE PRECISION for mkl_dcscmv.
COMPLEX for mkl_ccscmv.
DOUBLE COMPLEX for mkl_zcscmv.
Specifies the scalar alpha.
- matdescra
-
CHARACTER. Array of six elements, specifies properties of the matrix used for operation. Only first four array elements are used, their possible values are given in Table “Possible Values of the Parameter matdescra (descra)”. Possible combinations of element values of this parameter are given in Table “Possible Combinations of Element Values of the Parameter matdescra”.
- val
-
REAL for mkl_scscmv.
DOUBLE PRECISION for mkl_dcscmv.
COMPLEX for mkl_ccscmv.
DOUBLE COMPLEX for mkl_zcscmv.
Array containing non-zero elements of the matrix A.
For one-based indexing its length is pntre(k) - pntrb(1).
For zero-based indexing its length is pntre(m-1) - pntrb(0).
Refer to values array description in CSC Format for more details.
- indx
-
INTEGER. Array containing the row indices for each non-zero element of the matrix A.
Its length is equal to length of the val array.
Refer to rows array description in CSC Format for more details.
- pntrb
-
INTEGER. Array of length k.
For one-based indexing this array contains column indices, such that pntrb(i) - pntrb(1) + 1 is the first index of column i in the arrays val and indx.
For zero-based indexing this array contains column indices, such that pntrb(i) - pntrb(0) is the first index of column i in the arrays val and indx.
Refer to pointerb array description in CSC Format for more details.
- pntre
-
INTEGER. Array of length k.
For one-based indexing this array contains column indices, such that pntre(i) - pntrb(1) is the last index of column i in the arrays val and indx.
For zero-based indexing this array contains column indices, such that pntre(i) - pntrb(1) - 1 is the last index of column i in the arrays val and indx.
Refer to pointerE array description in CSC Format for more details.
- x
-
REAL for mkl_scscmv.
DOUBLE PRECISION for mkl_dcscmv.
COMPLEX for mkl_ccscmv.
DOUBLE COMPLEX for mkl_zcscmv.
Array, size at least k if transa = 'N' or 'n' and at least m otherwise. On entry, the array x must contain the vector x.
- beta
-
REAL for mkl_scscmv.
DOUBLE PRECISION for mkl_dcscmv.
COMPLEX for mkl_ccscmv.
DOUBLE COMPLEX for mkl_zcscmv.
Specifies the scalar beta.
- y
-
REAL for mkl_scscmv.
DOUBLE PRECISION for mkl_dcscmv.
COMPLEX for mkl_ccscmv.
DOUBLE COMPLEX for mkl_zcscmv.
Array, size at least m if transa = 'N' or 'n' and at least k otherwise. On entry, the array y must contain the vector y.
Output Parameters
- y
-
Overwritten by the updated vector y.
Interfaces
FORTRAN 77:
SUBROUTINE mkl_scscmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k, ldb, ldc
INTEGER indx(*), pntrb(m), pntre(m)
REAL alpha, beta
REAL val(*), x(*), y(*)
SUBROUTINE mkl_dcscmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k, ldb, ldc
INTEGER indx(*), pntrb(m), pntre(m)
DOUBLE PRECISION alpha, beta
DOUBLE PRECISION val(*), x(*), y(*)
SUBROUTINE mkl_ccscmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k, ldb, ldc
INTEGER indx(*), pntrb(m), pntre(m)
COMPLEX alpha, beta
COMPLEX val(*), x(*), y(*)
SUBROUTINE mkl_zcscmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k, ldb, ldc
INTEGER indx(*), pntrb(m), pntre(m)
DOUBLE COMPLEX alpha, beta
DOUBLE COMPLEX val(*), x(*), y(*)