Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

p?scal

Computes a product of a distributed vector by a scalar.

Syntax

void psscal
(
const MKL_INT
*n
,
const float
*a
,
float
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
);
void pdscal
(
const MKL_INT
*n
,
const double
*a
,
double
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
);
void pcscal
(
const MKL_INT
*n
,
const MKL_Complex8
*a
,
MKL_Complex8
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
);
void pzscal
(
const MKL_INT
*n
,
const MKL_Complex16
*a
,
MKL_Complex16
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
);
void pcsscal
(
const MKL_INT
*n
,
const float
*a
,
MKL_Complex8
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*incx
);
void pzdscal
(
const MKL_INT
*n
,
const double
*a
,
MKL_Complex16
*x
,
const MKL_INT
*ix
,
const MKL_INT
*jx
,
const MKL_INT
*descx
,
const MKL_INT
*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) The length of distributed vector
sub(
x
)
,
n
≥
0.
a
(global) and
pcsscal
Specifies the scalar
a
.
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.
Output Parameters
x
Overwritten by the updated distributed vector
sub(
x
)

Product and Performance Information

1

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