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asum(3) LAPACK asum(3)

NAME

asum - asum: sum | real( x_i ) | + | imag( x_i ) |

SYNOPSIS

Functions


double precision function dasum (n, dx, incx)
DASUM double precision function dzasum (n, zx, incx)
DZASUM real function sasum (n, sx, incx)
SASUM real function scasum (n, cx, incx)
SCASUM

Detailed Description

Function Documentation

double precision function dasum (integer n, double precision, dimension(*) dx, integer incx)

DASUM

Purpose:

!>
!>    DASUM takes the sum of the absolute values.
!>

Parameters

N 

!>          N is INTEGER
!>         number of elements in input vector(s)
!>

DX

!>          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!>

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of DX
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 3/93 to return if incx .le. 0.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!>

double precision function dzasum (integer n, complex*16, dimension(*) zx, integer incx)

DZASUM

Purpose:

!>
!>    DZASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
!>    returns a double precision result.
!>

Parameters

N 

!>          N is INTEGER
!>         number of elements in input vector(s)
!>

ZX

!>          ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!>

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of ZX
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, 3/11/78.
!>     modified 3/93 to return if incx .le. 0.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!>

real function sasum (integer n, real, dimension(*) sx, integer incx)

SASUM

Purpose:

!>
!>    SASUM takes the sum of the absolute values.
!>    uses unrolled loops for increment equal to one.
!>

Parameters

N 

!>          N is INTEGER
!>         number of elements in input vector(s)
!>

SX

!>          SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!>

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of SX
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 3/93 to return if incx .le. 0.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!>

real function scasum (integer n, complex, dimension(*) cx, integer incx)

SCASUM

Purpose:

!>
!>    SCASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
!>    returns a single precision result.
!>

Parameters

N 

!>          N is INTEGER
!>         number of elements in input vector(s)
!>

CX

!>          CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!>

INCX

!>          INCX is INTEGER
!>         storage spacing between elements of SX
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 3/93 to return if incx .le. 0.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!>

Author

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Tue Jun 30 2026 04:57:07 Version 3.12.0