Developer Reference

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

?asum

Computes the sum of magnitudes of the vector elements.

Syntax

res
=
sasum
(
n
,
x
,
incx
)
res
=
scasum
(
n
,
x
,
incx
)
res
=
dasum
(
n
,
x
,
incx
)
res
=
dzasum
(
n
,
x
,
incx
)
res
=
asum
(
x
)
Include Files
  • mkl.fi
    ,
    blas.f90
Description
The
?asum
routine computes the sum of the magnitudes of elements of a real vector, or the sum of magnitudes of the real and imaginary parts of elements of a complex vector:
res = |
Re
x
1
| + |
Im
x
1
| + |
Re
x
2
| +
Im
x
2
|+ ... + |
Re
x
n
| + |
Im
x
n
|,
where
x
is a vector with
n
elements.
Input Parameters
n
INTEGER
.
Specifies the number of elements in vector
x
.
x
REAL
for
sasum
DOUBLE PRECISION
for
dasum
COMPLEX
for
scasum
DOUBLE COMPLEX
for
dzasum
Array, size at least
(1 + (
n
-1)*abs(
incx
))
.
incx
INTEGER
.
Specifies the increment for indexing vector
x
.
Output Parameters
res
REAL
for
sasum
DOUBLE PRECISION
for
dasum
REAL
for
scasum
DOUBLE PRECISION
for
dzasum
Contains the sum of magnitudes of real and imaginary parts of all elements of the vector.
BLAS 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see BLAS 95 Interface Conventions .
Specific details for the routine
asum
interface are the following:
x
Holds the array of size
n
.

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 reserved 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