mkl_?csrsymv
mkl_?csrsymv
Computes matrix - vector product of a sparse symmetrical matrix stored in the CSR format (3-array variation) with one-based indexing (deprecated).
Syntax
void
mkl_scsrsymv
(
const
char
*uplo
,
const
MKL_INT
*m
,
const
float
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
float
*x
,
float
*y
);
void
mkl_dcsrsymv
(
const
char
*uplo
,
const
MKL_INT
*m
,
const
double
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
double
*x
,
double
*y
);
void
mkl_ccsrsymv
(
const
char
*uplo
,
const
MKL_INT
*m
,
const
MKL_Complex8
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
MKL_Complex8
*x
,
MKL_Complex8
*y
);
void
mkl_zcsrsymv
(
const
char
*uplo
,
const
MKL_INT
*m
,
const
MKL_Complex16
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
MKL_Complex16
*x
,
MKL_Complex16
*y
);
Include Files
- mkl.h
Description
This routine is deprecated. Use mkl_sparse_?_mvfrom the Inspector-executor Sparse BLAS interface instead.
Intel® oneAPI Math Kernel Library
The
mkl_?csrsymv
routine performs a matrix-vector operation defined as y := A*x
where:
x
and y
are vectors, A
is an upper or lower triangle of the symmetrical sparse matrix in the CSR format (3-array variation).This routine supports only one-based indexing of the input arrays.
Input Parameters
- uplo
- Specifies whether the upper or low triangle of the matrixAis used.Iforuplo='U''u', then the upper triangle of the matrixAis used.Iforuplo='L''l', then the low triangle of the matrixAis used.
- m
- Number of rows of the matrixA.
- a
- Array containing non-zero elements of the matrixA. Its length is equal to the number of non-zero elements in the matrixA. Refer tovaluesarray description in Sparse Matrix Storage Formats for more details.
- ia
- Array of length, containing indices of elements in the arraym+ 1a, such thatis the index in the arrayia[i] -ia[0]aof the first non-zero element from the rowi. The value of the last elementis equal to the number of non-zeros. Refer toia[m] -ia[0]rowIndexarray description in Sparse Matrix Storage Formats for more details.
- ja
- Array containing the column indicesplus onefor each non-zero element of the matrixA.Its length is equal to the length of the arraya. Refer tocolumnsarray description in Sparse Matrix Storage Formats for more details.
- x
- Array, size ism.On entry, the arrayxmust contain the vectorx.
Output Parameters
- y
- Array, size at leastm.On exit, the arrayymust contain the vectory.