mkl_cspblas_?csrgemv

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 12/16/2022

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mkl_cspblas_?csrgemv

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

Syntax

call mkl_cspblas_scsrgemv(transa, m, a, ia, ja, x, y)

call mkl_cspblas_dcsrgemv(transa, m, a, ia, ja, x, y)

call mkl_cspblas_ccsrgemv(transa, m, a, ia, ja, x, y)

call mkl_cspblas_zcsrgemv(transa, 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 Inspector-executor Sparse BLAS interface instead.

The mkl_cspblas_?csrgemv routine performs a matrix-vector operation defined as

y := A*x

y := A^T*x,

where:

x and y are vectors,

A is an m-by-m sparse square matrix in the CSR format (3-array variation) with zero-based indexing, A^T is the transpose of A.

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.

transa

CHARACTER*1. Specifies the operation.

If transa = 'N' or 'n', then the matrix-vector product is computed as y := A*x

If transa = 'T' or 't' or 'C' or 'c', then the matrix-vector product is computed as y := A^T*x,

m

INTEGER. Number of rows of the matrix A.

a

REAL for mkl_cspblas_scsrgemv.

DOUBLE PRECISION for mkl_cspblas_dcsrgemv.

COMPLEX for mkl_cspblas_ccsrgemv.

DOUBLE COMPLEX for mkl_cspblas_zcsrgemv.

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) 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_scsrgemv.

DOUBLE PRECISION for mkl_cspblas_dcsrgemv.

COMPLEX for mkl_cspblas_ccsrgemv.

DOUBLE COMPLEX for mkl_cspblas_zcsrgemv.

Array, size is m.

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

Output Parameters

y

REAL for mkl_cspblas_scsrgemv.

DOUBLE PRECISION for mkl_cspblas_dcsrgemv.

COMPLEX for mkl_cspblas_ccsrgemv.

DOUBLE COMPLEX for mkl_cspblas_zcsrgemv.

Array, size at least m.

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

Interfaces

FORTRAN 77:

SUBROUTINE mkl_cspblas_scsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m

   INTEGER      ia(*), ja(*)

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

SUBROUTINE mkl_cspblas_dcsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m

   INTEGER      ia(*), ja(*)

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

SUBROUTINE mkl_cspblas_ccsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m

   INTEGER      ia(*), ja(*)

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

SUBROUTINE mkl_cspblas_zcsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   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_?csrgemv

FORTRAN 77: