Developer Reference

  • 098
  • 03/30/2020
  • Public Content
Contents

p?scal

Computes a product of a distributed vector by a scalar.

Syntax

call psscal
(
n
,
a
,
x
,
ix
,
jx
,
descx
,
incx
)
call pdscal
(
n
,
a
,
x
,
ix
,
jx
,
descx
,
incx
)
call pcscal
(
n
,
a
,
x
,
ix
,
jx
,
descx
,
incx
)
call pzscal
(
n
,
a
,
x
,
ix
,
jx
,
descx
,
incx
)
call pcsscal
(
n
,
a
,
x
,
ix
,
jx
,
descx
,
incx
)
call pzdscal
(
n
,
a
,
x
,
ix
,
jx
,
descx
,
incx
)
Include Files
  • mkl_pblas.h
Description
The
p?scal
routines multiplies a
n
-element distributed vector
sub(
x
)
by the scalar
a
:
sub(
x
) =
a
*sub(
x
),
where
sub(
x
)
denotes
X
(
ix
,
jx
:
jx
+
n
-1)
if
incx
=
m_x
, and
X
(
ix
:
ix
+
n
-1,
jx
)
if
incx
= 1
.
Input Parameters
n
(global)
INTEGER
.
The length of distributed vector
sub(
x
)
,
n
0.
a
(global)
REAL
for
psscal
and
pcsscal
DOUBLE PRECISION
for
pdscal
and
pzdscal
COMPLEX
for
pcscal
DOUBLE COMPLEX
for
pzscal
Specifies the scalar
a
.
x
(local)
REAL
for
psscal
DOUBLE PRECISION
for
pdscal
COMPLEX
for
pcscal
and
pcsscal
DOUBLE COMPLEX
for
pzscal
and
pzdscal
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.
Output Parameters
x
Overwritten by the updated distributed vector
sub(
x
)
1

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reservered for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804