Contents

# mkl_?coomv

Computes matrix - vector product for a sparse matrix in the coordinate format (deprecated).

## Syntax

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_?coomv
routine performs a matrix-vector operation defined as
`y := alpha*A*x + beta*y`
or
`y := alpha*AT*x + beta*y,`
where:
alpha
and
beta
are scalars,
x
and
y
are vectors,
A
is an
m
-by-
k
sparse matrix in compressed coordinate format,
A
T
is the transpose of
A
.
This routine supports a coordinate format both with one-based indexing and zero-based indexing.
Input Parameters
transa
Specifies the operation.
If
transa
=
'N'
or
'n'
, then
y
:=
alpha
*
A
*
x
+
beta
*
y
If
transa
=
'T'
or
't'
or
'C'
or
'c'
, then
y
:=
alpha
*
A
T
*
x
+
beta
*
y
,
m
Number of rows of the matrix
A
.
k
Number of columns of 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 of length
nnz
, contains non-zero elements of the matrix
A
in the arbitrary order.
Refer to
values
array description in Coordinate Format for more details.
rowind
Array of length
nnz
.
For one-based indexing, contains the row indices plus one for each non-zero element of the matrix
A
.
For zero-based indexing, contains the row indices for each non-zero element of the matrix
A
.
Refer to
rows
array description in Coordinate Format for more details.
colind
Array of length
nnz
.
For one-based indexing, contains the column indices plus one for each non-zero element of the matrix
A
.
For zero-based indexing, contains the column indices for each non-zero element of the matrix
A
.
Refer to
columns
array description in Coordinate Format for more details.
nnz
Specifies the number of non-zero element of the matrix
A
.
Refer to
nnz
description in Coordinate Format for more details.
x
Array, size at least
k
if
transa
=
'N'
or
'n'
and at least
m
otherwise. On entry, the array
x
must contain the vector
x
.
beta
Specifies the scalar
beta
.
y
Array, size at least
m
if
transa
=
'N'
or
'n'
and at least
k
otherwise. On entry, the array
y
must contain the vector
y
.
Output Parameters
y
Overwritten by the updated vector
y
.

#### Product and Performance Information

1

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