## Developer Reference

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

# p?dotu

Computes the dot product of two distributed complex vectors.

## Syntax

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)
INTEGER
.
The length of distributed vectors,
n
0.
x
(local)
COMPLEX
for
pcdotu
DOUBLE COMPLEX
for
pzdotu
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)
INTEGER
.
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)
INTEGER
array of dimension 9. The array descriptor of the distributed matrix
X
.
incx
(global)
INTEGER
.
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)
COMPLEX
for
pcdotu
DOUBLE COMPLEX
for
pzdotu
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)
INTEGER
.
The row and column indices in the distributed matrix
Y
indicating the first row and the first column of the submatrix
sub(
Y
)