mkl_cspblas_?csrsymv

Developer Reference for Intel® oneAPI Math Kernel Library for C

Download PDF

ID 766684

Date 11/07/2023

Version

Public

A newer version of this document is available. Customers should click here to go to the newest version.

Visible to Intel only — GUID: GUID-23B803A8-7C46-4705-989B-7BDD1D5E031A

View Details

mkl_cspblas_?csrsymv

Computes matrix-vector product of a sparse symmetrical matrix stored in the CSR format (3-array variation) with zero-based indexing (deprecated).

Syntax

void mkl_cspblas_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_cspblas_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_cspblas_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_cspblas_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 Intel® oneAPI Math Kernel Library (oneMKL) Inspector-executor Sparse BLAS interface instead.

The mkl_cspblas_?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) with zero-based indexing.

NOTE:

This routine supports only zero-based indexing of the input arrays.

Input Parameters

uplo

Specifies whether the upper or low triangle of the matrix A is used.

If uplo = 'U' or 'u', then the upper triangle of the matrix A is used.

If uplo = 'L' or 'l', then the low triangle of the matrix A is used.

m

Number of rows of the matrix A.

a

Array containing non-zero elements of the matrix A. Its length is equal to the number of non-zero elements in the matrix A. Refer to values array description in Sparse Matrix Storage Formats for more details.

ia

Array of length m + 1, containing indices of elements in the array a, such that ia[i] is the index in the array a of the first non-zero element from the row i. The value of the last element ia[m] is equal to the number of non-zeros. Refer to rowIndex array description in Sparse Matrix Storage Formats for more details.

ja

Array containing the column indices for each non-zero element of the matrix A.

Its length is equal to the length of the array a. Refer to columns array description in Sparse Matrix Storage Formats for more details.

x

Array, size is m.

On entry, the array x must contain the vector x.

Output Parameters

y

Array, size at least m.

On exit, the array y must contain the vector y.

Parent topic: Sparse BLAS Level 2 and Level 3 Routines.

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Developer Reference for Intel® oneAPI Math Kernel Library for C

mkl_cspblas_?csrsymv

Syntax

Include Files

Description

Input Parameters

Output Parameters