mkl_cspblas_?bsrgemv

Syntax

Fortran:

call mkl_cspblas_sbsrgemv(transa, m, lb, a, ia, ja, x, y)

call mkl_cspblas_dbsrgemv(transa, m, lb, a, ia, ja, x, y)

call mkl_cspblas_cbsrgemv(transa, m, lb, a, ia, ja, x, y)

call mkl_cspblas_zbsrgemv(transa, m, lb, a, ia, ja, x, y)

C:

mkl_cspblas_sbsrgemv(&transa, &m, &lb, a, ia, ja, x, y);

mkl_cspblas_dbsrgemv(&transa, &m, &lb, a, ia, ja, x, y);

mkl_cspblas_cbsrgemv(&transa, &m, &lb, a, ia, ja, x, y);

mkl_cspblas_zbsrgemv(&transa, &m, &lb, a, ia, ja, x, y);

Include Files

The FORTRAN 77 interfaces are specified in the mkl_spblas.fi include file and the C interfaces are specified in the mkl_spblas.h include file.

Description

The mkl_cspblas_?bsrgemv routine performs a matrix-vector operation defined as y := A*x

or y := A'*x,

where:

x and y are vectors,

A is an m-by-m block sparse square matrix in the BSR format (3-array variation) with zero-based indexing, A' 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'*x,

m

INTEGER. Number of block rows of the matrix A.

lb

INTEGER. Size of the block in the matrix A.

a

REAL for mkl_cspblas_sbsrgemv.

DOUBLE PRECISION for mkl_cspblas_dbsrgemv.

COMPLEX for mkl_cspblas_cbsrgemv.

DOUBLE COMPLEX for mkl_cspblas_zbsrgemv.

Array containing elements of non-zero blocks of the matrix A. Its length is equal to the number of non-zero blocks in the matrix A multiplied by lb*lb. Refer to values array description in BSR Format for more details.

ia

INTEGER. Array of length (m + 1), containing indices of block 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-zero blocks. Refer to rowIndex array description in BSR Format for more details.

ja

INTEGER. Array containing the column indices for each non-zero block in the matrix A.

Its length is equal to the number of non-zero blocks of the matrix A. Refer to columns array description in BSR Format for more details.

x

REAL for mkl_cspblas_sbsrgemv.

DOUBLE PRECISION for mkl_cspblas_dbsrgemv.

COMPLEX for mkl_cspblas_cbsrgemv.

DOUBLE COMPLEX for mkl_cspblas_zbsrgemv.

Array, DIMENSION (m*lb).

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

Output Parameters

y

REAL for mkl_cspblas_sbsrgemv.

DOUBLE PRECISION for mkl_cspblas_dbsrgemv.

COMPLEX for mkl_cspblas_cbsrgemv.

DOUBLE COMPLEX for mkl_cspblas_zbsrgemv.

Array, DIMENSION at least (m*lb).

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

Interfaces

SUBROUTINE mkl_cspblas_sbsrgemv(transa, m, lb, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m, lb

   INTEGER      ia(*), ja(*)

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

SUBROUTINE mkl_cspblas_dbsrgemv(transa, m, lb, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m, lb

   INTEGER      ia(*), ja(*)

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

SUBROUTINE mkl_cspblas_cbsrgemv(transa, m, lb, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m, lb

   INTEGER      ia(*), ja(*)

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

SUBROUTINE mkl_cspblas_zbsrgemv(transa, m, lb, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m, lb

   INTEGER      ia(*), ja(*)

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

void mkl_cspblas_sbsrgemv(char *transa, int *m, int *lb,

float *a, int *ia, int *ja, float *x, float *y);

void mkl_cspblas_dbsrgemv(char *transa, int *m, int *lb,

double *a, int *ia, int *ja, double *x, double *y);

void mkl_cspblas_cbsrgemv(char *transa, int *m, int *lb,

MKL_Complex8 *a, int *ia, int *ja, MKL_Complex8 *x, MKL_Complex8 *y);

void mkl_cspblas_zbsrgemv(char *transa, int *m, int *lb,

MKL_Complex16 *a, int *ia, int *ja, MKL_Complex16 *x, MKL_Complex16 *y);