| asum(3) | LAPACK | asum(3) |
asum - asum: sum | real( x_i ) | + | imag( x_i ) |
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
DASUM
Purpose:
DASUM takes the sum of the absolute values.
Parameters
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 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(*)
DZASUM
Purpose:
DZASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
returns a double precision result.
Parameters
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 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(*)
SASUM
Purpose:
SASUM takes the sum of the absolute values.
uses unrolled loops for increment equal to one.
Parameters
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 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(*)
SCASUM
Purpose:
SCASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
returns a single precision result.
Parameters
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 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(*)
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| Thu Aug 7 2025 17:26:25 | Version 3.12.0 |