Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

p?sum1

Forms the 1-norm of a complex vector similar to Level 1 PBLAS
p?asum
, but using the true absolute value.

Syntax

void
pscsum1
(
MKL_INT
*n
,
float
*asum
,
MKL_Complex8
*x
,
MKL_INT
*ix
,
MKL_INT
*jx
,
MKL_INT
*descx
,
MKL_INT
*incx
);
void
pdzsum1
(
MKL_INT
*n
,
double
*asum
,
MKL_Complex16
*x
,
MKL_INT
*ix
,
MKL_INT
*jx
,
MKL_INT
*descx
,
MKL_INT
*incx
);
Include Files
  • mkl_scalapack.h
Description
The
p?sum1
function
returns the sum of absolute values of a complex distributed vector sub(
x
) in
asum
, where sub(
x
) denotes
X
(
ix
:
ix
+
n
-1,
jx
:
jx
)
, if
incx
 = 1
,
X
(
ix
:
ix
,
jx
:
jx
+
n
-1)
, if
incx
 =
m_x
.
Based on
p?asum
 from the Level 1 PBLAS. The change is to use the 'genuine' absolute value.
Input Parameters
n
(global). The number of components of the distributed vector sub(
x
).
n
≥
 0.
x
(local )
Pointer into the local memory to an array of size
lld_x
 *
LOCc
(
jx
+
n
-1)
. This array contains the local pieces of the distributed vector sub(
X
).
ix
(global) The row index in the global matrix
X
 indicating the first row of sub(
X
).
jx
(global) The column index in the global matrix
X
 indicating the first column of sub(
X
)
descx
(local) Array of size
dlen_
=9. The array descriptor for the distributed matrix
X
.
incx
(global) The global increment for the elements of
X
. Only two values of
incx
 are supported in this version, namely 1 and
m_x
.
Output Parameters
asum
(local)
The sum of absolute values of the distributed vector sub(
X
) only in its scope.

Product and Performance Information

1

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