Visible to Intel only — GUID: GUID-4E66BEBA-8F19-487A-94B9-D243037AAF56
Visible to Intel only — GUID: GUID-4E66BEBA-8F19-487A-94B9-D243037AAF56
mkl_?skymv
Computes matrix - vector product for a sparse matrix in the skyline storage format with one-based indexing (deprecated).
Syntax
call mkl_sskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
call mkl_dskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
call mkl_cskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
call mkl_zskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
Include Files
- mkl.fi
Description
This routine is deprecated, but no replacement is available yet in the Inspector-Executor Sparse BLAS API interfaces. You can continue using this routine until a replacement is provided and this can be fully removed.
The mkl_?skymv 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 stored using the skyline storage scheme, AT is the transpose of A.
This routine supports only one-based indexing of the input arrays.
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_sskymv.
DOUBLE PRECISION for mkl_dskymv.
COMPLEX for mkl_cskymv.
DOUBLE COMPLEX for mkl_zskymv.
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”.
NOTE:General matrices (matdescra(1)='G') is not supported.
- val
-
REAL for mkl_sskymv.
DOUBLE PRECISION for mkl_dskymv.
COMPLEX for mkl_cskymv.
DOUBLE COMPLEX for mkl_zskymv.
Array containing the set of elements of the matrix A in the skyline profile form.
If matdescrsa(2)= 'L', then val contains elements from the low triangle of the matrix A.
If matdescrsa(2)= 'U', then val contains elements from the upper triangle of the matrix A.
Refer to values array description in Skyline Storage Scheme for more details.
- pntr
-
INTEGER. Array of length (m + 1) for lower triangle, and (k + 1) for upper triangle.
It contains the indices specifying in the val the positions of the first element in each row (column) of the matrix A. Refer to pointers array description in Skyline Storage Scheme for more details.
- x
-
REAL for mkl_sskymv.
DOUBLE PRECISION for mkl_dskymv.
COMPLEX for mkl_cskymv.
DOUBLE COMPLEX for mkl_zskymv.
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_sskymv.
DOUBLE PRECISION for mkl_dskymv.
COMPLEX for mkl_cskymv.
DOUBLE COMPLEX for mkl_zskymv.
Specifies the scalar beta.
- y
-
REAL for mkl_sskymv.
DOUBLE PRECISION for mkl_dskymv.
COMPLEX for mkl_cskymv.
DOUBLE COMPLEX for mkl_zskymv.
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_sskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER pntr(*)
REAL alpha, beta
REAL val(*), x(*), y(*)
SUBROUTINE mkl_dskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER pntr(*)
DOUBLE PRECISION alpha, beta
DOUBLE PRECISION val(*), x(*), y(*)
SUBROUTINE mkl_cdskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER pntr(*)
COMPLEX alpha, beta
COMPLEX val(*), x(*), y(*)
SUBROUTINE mkl_zskymv(transa, m, k, alpha, matdescra, val, pntr, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER pntr(*)
DOUBLE COMPLEX alpha, beta
DOUBLE COMPLEX val(*), x(*), y(*)