Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

mkl_?bsrgemv

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

Syntax

void
mkl_sbsrgemv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*lb
,
const
float
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
float
*x
,
float
*y
);
void
mkl_dbsrgemv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*lb
,
const
double
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
double
*x
,
double
*y
);
void
mkl_cbsrgemv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*lb
,
const
MKL_Complex8
*a
,
const
MKL_INT
*ia
,
const
MKL_INT
*ja
,
const
MKL_Complex8
*x
,
MKL_Complex8
*y
);
void
mkl_zbsrgemv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*lb
,
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
 Inspector-executor Sparse BLAS interface instead.
The
mkl_?bsrgemv
 routine performs a matrix-vector operation defined as 
y := A*x
or 
y := A
T
*x,
where:
x
 and
y
 are vectors,
A
 is an
m
-by-
m
 block sparse square matrix in the BSR format (3-array variation),
A
T
 is the transpose of
A
.
This routine supports only one-based indexing of the input arrays.
Input Parameters
transa
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
Number of block rows of the matrix
A
.
lb
Size of the block in the matrix
A
.
a
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
Array of length
(
m
 + 1)
, containing indices of block in the array
a
, such that
ia
[
i
] -
ia
[0]
 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
] -
ia
[0]
 is equal to the number of non-zero blocks. Refer to
rowIndex
 array description in BSR Format for more details.
ja
Array containing the column indices
plus one
 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
Array, size
(
m
*
lb
)
.
On entry, the array
x
 must contain the vector
x
.
Output Parameters
y
Array, size at least
(
m
*
lb
)
.
On exit, the array
y
 must contain the vector
y
.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.