mkl_cspblas_?csrsymv

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/22/2024

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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

call mkl_cspblas_scsrsymv(uplo, m, a, ia, ja, x, y)

call mkl_cspblas_dcsrsymv(uplo, m, a, ia, ja, x, y)

call mkl_cspblas_ccsrsymv(uplo, m, a, ia, ja, x, y)

call mkl_cspblas_zcsrsymv(uplo, m, a, ia, ja, x, 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_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

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.

uplo

CHARACTER*1. 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

INTEGER. Number of rows of the matrix A.

a

REAL for mkl_cspblas_scsrsymv.

DOUBLE PRECISION for mkl_cspblas_dcsrsymv.

COMPLEX for mkl_cspblas_ccsrsymv.

DOUBLE COMPLEX for mkl_cspblas_zcsrsymv.

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

INTEGER. 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 + 1) is equal to the number of non-zeros. Refer to rowIndex array description in Sparse Matrix Storage Formats for more details.

ja

INTEGER. 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

REAL for mkl_cspblas_scsrsymv.

DOUBLE PRECISION for mkl_cspblas_dcsrsymv.

COMPLEX for mkl_cspblas_ccsrsymv.

DOUBLE COMPLEX for mkl_cspblas_zcsrsymv.

Array, size is m.

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

Output Parameters

y

REAL for mkl_cspblas_scsrsymv.

DOUBLE PRECISION for mkl_cspblas_dcsrsymv.

COMPLEX for mkl_cspblas_ccsrsymv.

DOUBLE COMPLEX for mkl_cspblas_zcsrsymv.

Array, size at least m.

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

Interfaces

FORTRAN 77:

SUBROUTINE mkl_cspblas_scsrsymv(uplo, m, a, ia, ja, x, y)

   CHARACTER*1  uplo

   INTEGER      m

   INTEGER      ia(*), ja(*)

   REAL         a(*), x(*), y(*)

SUBROUTINE mkl_cspblas_dcsrsymv(uplo, m, a, ia, ja, x, y)

   CHARACTER*1        uplo

   INTEGER            m

   INTEGER            ia(*), ja(*)

   DOUBLE PRECISION   a(*), x(*), y(*)

SUBROUTINE mkl_cspblas_ccsrsymv(uplo, m, a, ia, ja, x, y)

   CHARACTER*1  uplo

   INTEGER      m

   INTEGER      ia(*), ja(*)

   COMPLEX      a(*), x(*), y(*)

SUBROUTINE mkl_cspblas_zcsrsymv(uplo, m, a, ia, ja, x, y)

   CHARACTER*1      uplo

   INTEGER          m

   INTEGER          ia(*), ja(*)

   DOUBLE COMPLEX   a(*), x(*), y(*)

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

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

mkl_cspblas_?csrsymv

Syntax

Include Files

Description

Input Parameters

Output Parameters

Interfaces

FORTRAN 77: