Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

mkl_?csrgemv

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

Syntax

call mkl_scsrgemv
(
transa
,
m
,
a
,
ia
,
ja
,
x
,
y
)
call mkl_dcsrgemv
(
transa
,
m
,
a
,
ia
,
ja
,
x
,
y
)
call mkl_ccsrgemv
(
transa
,
m
,
a
,
ia
,
ja
,
x
,
y
)
call mkl_zcsrgemv
(
transa
,
m
,
a
,
ia
,
ja
,
x
,
y
)
Include Files
  • mkl.fi
Description
This routine is deprecated. Use mkl_sparse_?_mv from the
Intel® MKL
Inspector-executor Sparse BLAS interface instead.
The
mkl_?csrgemv
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
sparse square matrix in the CSR format (3-array variation),
A
T
is the transpose of
A
.
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 as
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
.
a
REAL
for
mkl_scsrgemv
.
DOUBLE PRECISION
for
mkl_dcsrgemv
.
COMPLEX
for
mkl_ccsrgemv
.
DOUBLE COMPLEX
for
mkl_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
+ 1)
is equal to the number of non-zeros
plus one
. Refer to
rowIndex
array description in