Contents

# mkl_?bsrmm

Computes matrix - matrix product of a sparse matrix stored in the BSR format (deprecated).

## Syntax

Include Files
• mkl.h
Description
This routine is deprecated. Use Use mkl_sparse_?_mmfrom the
Intel® oneAPI Math Kernel Library
The
mkl_?bsrmm
routine performs a matrix-matrix operation defined as
`C := alpha*A*B + beta*C`
or
`C := alpha*AT*B + beta*C`
or
`C := alpha*AH*B + beta*C,`
where:
alpha
and
beta
are scalars,
B
and
C
are dense matrices,
A
is an
m
-by-
k
sparse matrix in block sparse row (BSR) format,
A
T
is the transpose of
A
, and
A
H
is the conjugate transpose of
A
.
This routine supports a BSR format both with one-based indexing and zero-based indexing.
Input Parameters
transa
Specifies the operation.
If
transa
=
'N'
or
'n'
, then the matrix-matrix product is computed as
C
:=
alpha
*
A
*
B
+
beta
*
C
If
transa
=
'T'
or
't'
, then the matrix-vector product is computed as
C
:=
alpha
*
A
T
*
B
+
beta
*
C
If
transa
=
'C'
or
'c'
, then the matrix-vector product is computed as
C
:=
alpha
*
A
H
*
B
+
beta
*
C
,
m
Number of block rows of the matrix
A
.
n
Number of columns of the matrix
C
.
k
Number of block columns of the matrix
A
.
lb
Size of the block in the matrix
A
.
alpha
Specifies the scalar
alpha
.
matdescra
Array of six elements, specifies properties of the matrix used for operation. Only first four array elements are used, their possible values are given in
Table “Possible Values of the Parameter
matdescra
(
descra
)”
. Possible combinations of element values of this parameter are given in
Table “Possible Combinations of Element Values of the Parameter
matdescra
.
val
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 the
values
array description in BSR Format for more details.
indx
For one-based indexing, array containing the column indices plus one for each non-zero block in the matrix
A
.
For zero-based indexing, 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 in the matrix
A
. Refer to the
columns
array description in BSR Format for more details.
pntrb
Array of length
m
.
This array contains row indices, such that
pntrb
[
I
] -
pntrb
[0]
is the first index of block row
I
in the array
indx
.
Refer to
pointerB
array description in BSR Format for more details.
pntre
Array of length
m
.
This array contains row indices, such that
pntre
[
I
] -
pntrb
[0] - 1
is the last index of block row
I
in the array
indx
.
Refer to
pointerE
array description in BSR Format for more details.
b
Array, size
ldb
by at least
n
for non-transposed matrix
A
and at least
m
for transposed for one-based indexing, and (at least
k
for non-transposed matrix
A
and at least
m
for transposed,
ldb
) for zero-based indexing.
On entry with
transa=
'N'
or
'n'
n
-by-
k
block part of the array
b
must contain the matrix
B
m
-by-
n
block part of the array
b
must contain the matrix
B
.
ldb
Specifies the leading dimension (in blocks) of
b
as declared in the calling (sub)program.
beta
Specifies the scalar
beta
.
c
Array, size
ldc
*
n
for one-based indexing, size
k
*
ldc
for zero-based indexing.
m
-by-
n
block part of the array
c
must contain the matrix
C
n
-by- block part of the array
c
must contain the matrix
C
.
ldc
Specifies the leading dimension (in blocks) of
c
as declared in the calling (sub)program.
Output Parameters
c
Overwritten by the matrix
(
alpha
*
A
*
B
+
beta
*
C
)
or
(
alpha
*
A
T
*
B
+
beta
*
C
)
or
(
alpha
*
A
H
*
B
+
beta
*
C
)
.

#### Product and Performance Information

1

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