Visible to Intel only — GUID: GUID-01FBC682-972A-4330-AADA-D719B4AD7B5D
Visible to Intel only — GUID: GUID-01FBC682-972A-4330-AADA-D719B4AD7B5D
mkl_?csrmv
Computes matrix - vector product of a sparse matrix stored in the CSR format (deprecated).
Syntax
call mkl_scsrmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
call mkl_dcsrmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
call mkl_ccsrmv(transa, m, k, alpha, matdescra, val, indx, pntrb, pntre, x, beta, y)
call mkl_zcsrmv(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_?csrmv 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 the CSR format, AT is the transpose of A.
This routine supports a CSR 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_scsrmv.
DOUBLE PRECISION for mkl_dcsrmv.
COMPLEX for mkl_ccsrmv.
DOUBLE COMPLEX for mkl_zcsrmv.
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_scsrmv.
DOUBLE PRECISION for mkl_dcsrmv.
COMPLEX for mkl_ccsrmv.
DOUBLE COMPLEX for mkl_zcsrmv.
Array containing non-zero elements of the matrix A.
For one-based indexing its length is pntre(m) - pntrb(1).
For zero-based indexing its length is pntre(m-1) - pntrb(0).
Refer to values array description in CSR Format for more details.
- indx
-
INTEGER. Array containing the column indices for each non-zero element of the matrix A.
Its length is equal to length of the val array.
Refer to columns array description in CSR Format for more details.
- pntrb
-
INTEGER. Array of length m.
For one-based indexing this array contains row indices, such that pntrb(i) - pntrb(1) + 1 is the first index of row i in the arrays val and indx.
For zero-based indexing this array contains row indices, such that pntrb(i) - pntrb(0) is the first index of row i in the arrays val and indx.
Refer to pointerb array description in CSR Format for more details.
- pntre
-
INTEGER. Array of length m.
For one-based indexing this array contains row indices, such that pntre(i) - pntrb(1) is the last index of row i in the arrays val and indx.
For zero-based indexing this array contains row indices, such that pntre(i) - pntrb(0)-1 is the last index of row i in the arrays val and indx.
Refer to pointerE array description in CSR Format for more details.
- x
-
REAL for mkl_scsrmv.
DOUBLE PRECISION for mkl_dcsrmv.
COMPLEX for mkl_ccsrmv.
DOUBLE COMPLEX for mkl_zcsrmv.
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_scsrmv.
DOUBLE PRECISION for mkl_dcsrmv.
COMPLEX for mkl_ccsrmv.
DOUBLE COMPLEX for mkl_zcsrmv.
Specifies the scalar beta.
- y
-
REAL for mkl_scsrmv.
DOUBLE PRECISION for mkl_dcsrmv.
COMPLEX for mkl_ccsrmv.
DOUBLE COMPLEX for mkl_zcsrmv.
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_scsrmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER indx(*), pntrb(m), pntre(m)
REAL alpha, beta
REAL val(*), x(*), y(*)
SUBROUTINE mkl_dcsrmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER indx(*), pntrb(m), pntre(m)
DOUBLE PRECISION alpha, beta
DOUBLE PRECISION val(*), x(*), y(*)
SUBROUTINE mkl_ccsrmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER indx(*), pntrb(m), pntre(m)
COMPLEX alpha, beta
COMPLEX val(*), x(*), y(*)
SUBROUTINE mkl_zcsrmv(transa, m, k, alpha, matdescra, val, indx,
pntrb, pntre, x, beta, y)
CHARACTER*1 transa
CHARACTER matdescra(*)
INTEGER m, k
INTEGER indx(*), pntrb(m), pntre(m)
DOUBLE COMPLEX alpha, beta
DOUBLE COMPLEX val(*), x(*), y(*)