mkl_?diagemv

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 10/31/2024

Version

Public

Visible to Intel only — GUID: GUID-D2F09759-2F8D-4758-8A69-01B1730DA85D

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mkl_?diagemv

Computes matrix - vector product of a sparse general matrix stored in the diagonal format with one-based indexing (deprecated).

Syntax

call mkl_sdiagemv(transa, m, val, lval, idiag, ndiag, x, y)

call mkl_ddiagemv(transa, m, val, lval, idiag, ndiag, x, y)

call mkl_cdiagemv(transa, m, val, lval, idiag, ndiag, x, y)

call mkl_zdiagemv(transa, m, val, lval, idiag, ndiag, x, y)

Include Files

mkl.fi

Description

This routine is deprecated, but no replacement is available yet in the Inspector-Executor Sparse BLAS API interfaces. You can continue using this routine until a replacement is provided and this can be fully removed.

The mkl_?diagemv 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 diagonal storage format, A^T is the transpose of A.

NOTE:

This routine supports only one-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 y := A*x

If transa = 'T' or 't' or 'C' or 'c', then y := A^T*x,

m

INTEGER. Number of rows of the matrix A.

val

REAL for mkl_sdiagemv.

DOUBLE PRECISION for mkl_ddiagemv.

COMPLEX for mkl_ccsrgemv.

DOUBLE COMPLEX for mkl_zdiagemv.

Two-dimensional array of size lval*ndiag, contains non-zero diagonals of the matrix A. Refer to values array description in Diagonal Storage Scheme for more details.

lval

INTEGER. Leading dimension of vallval≥m. Refer to lval description in Diagonal Storage Scheme for more details.

idiag

INTEGER. Array of length ndiag, contains the distances between main diagonal and each non-zero diagonals in the matrix A.

Refer to distance array description in Diagonal Storage Scheme for more details.

ndiag

INTEGER. Specifies the number of non-zero diagonals of the matrix A.

x

REAL for mkl_sdiagemv.

DOUBLE PRECISION for mkl_ddiagemv.

COMPLEX for mkl_ccsrgemv.

DOUBLE COMPLEX for mkl_zdiagemv.

Array, size is m.

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

Output Parameters

y

REAL for mkl_sdiagemv.

DOUBLE PRECISION for mkl_ddiagemv.

COMPLEX for mkl_ccsrgemv.

DOUBLE COMPLEX for mkl_zdiagemv.

Array, size at least m.

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

Interfaces

FORTRAN 77:

SUBROUTINE mkl_sdiagemv(transa, m, val, lval, idiag, ndiag, x, y)

  CHARACTER*1   transa

  INTEGER       m, lval, ndiag

  INTEGER      idiag(*)

  REAL           val(lval,*), x(*), y(*)

SUBROUTINE mkl_ddiagemv(transa, m, val, lval, idiag, ndiag, x, y)

  CHARACTER*1   transa

  INTEGER       m, lval, ndiag

  INTEGER      idiag(*)

  DOUBLE PRECISION       val(lval,*), x(*), y(*)

SUBROUTINE mkl_cdiagemv(transa, m, val, lval, idiag, ndiag, x, y)

  CHARACTER*1   transa

  INTEGER       m, lval, ndiag

  INTEGER      idiag(*)

  COMPLEX    val(lval,*), x(*), y(*)

SUBROUTINE mkl_zdiagemv(transa, m, val, lval, idiag, ndiag, x, y)

  CHARACTER*1   transa

  INTEGER       m, lval, ndiag

  INTEGER      idiag(*)

  DOUBLE COMPLEX        val(lval,*), 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_?diagemv

Syntax

Include Files

Description

Input Parameters

Output Parameters

Interfaces

FORTRAN 77: