Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

p?dotu

Computes the dot product of two distributed complex vectors.

Syntax

void pcdotu
(
const MKL_INT
*n
,
MKL_Complex8
*dotu
,
const MKL_Complex8
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
,
const MKL_Complex8
*y
,
const MKL_INT
*iy
,
const MKL_INT
*jy
,
const MKL_INT
*descy
,
const MKL_INT
*incy
);
void pzdotu
(
const MKL_INT
*n
,
MKL_Complex16
*dotu
,
const MKL_Complex16
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
,
const MKL_Complex16
*y
,
const MKL_INT
*iy
,
const MKL_INT
*jy
,
const MKL_INT
*descy
,
const MKL_INT
*incy
);
Include Files
  • mkl_pblas.h
Description
The
p?dotu
 functions compute the dot product
dotu
 of two distributed vectors defined as 
dotu  = sub(x)'*sub(y)
where
sub(
x
)
 and
sub(
y
)
 are
n
-element distributed vectors.
sub(
x
)
 denotes
X
(
ix
,
jx
:
jx
+
n
-1)
 if
incx
=
m_x
, and
X
(
ix
:
ix
+
n
-1,
jx
)
 if
incx
= 1
;
sub(
y
)
 denotes
Y
(
iy
,
jy
:
jy
+
n
-1)
 if
incy
=
m_y
, and
Y
(
iy
:
iy
+
n
-1,
jy
)
 if
incy
= 1
.
Input Parameters
n
(global) The length of distributed vectors,
n
≥
0.
x
(local)
Array, size
(
jx
-1)*
m_x
 +
ix
+(
n
-1)*abs(
incx
))
.
This array contains the entries of the distributed vector
sub(
x
)
.
ix
,
jx
(global) The row and column indices in the distributed matrix
X
 indicating the first row and the first column of the submatrix
sub(
X
)
, respectively.
descx
(global and local) array of dimension 9. The array descriptor of the distributed matrix
X
.
incx
(global) Specifies the increment for the elements of
sub(
x
)
. Only two values are supported, namely 1 and
m_x
.
incx
 must not be zero.
y
(local)
Array, size
(
jy
-1)*
m_y
 +
iy
+(
n
-1)*abs(
incy
))
.
This array contains the entries of the distributed vector
sub(
y
)
.
iy
,
jy
(global) The row and column indices in the distributed matrix
Y
 indicating the first row and the first column of the submatrix
sub(
Y
)
, respectively.
descy
(global and local) array of dimension 9. The array descriptor of the distributed matrix
Y
.
incy
(global) Specifies the increment for the elements of
sub(
y
)
. Only two values are supported, namely 1 and
m_y
.
incy
 must not be zero.
Output Parameters
dotu
(local)
Dot product of
sub(
x
)
 and
sub(
y
)
 only in their scope.

Product and Performance Information

1

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