Library Functions Manual

NAME¶

sum1 - sum1: sum | x_i | (in LAPACK)

SYNOPSIS¶

Functions¶

double precision function DZSUM1 (n, cx, incx)
DZSUM1 forms the 1-norm of the complex vector using the true absolute value. real function SCSUM1 (n, cx, incx)
SCSUM1 forms the 1-norm of the complex vector using the true absolute value.

Detailed Description¶

Function Documentation¶

double precision function DZSUM1 (integer n, complex16, dimension( ) cx, integer incx)¶

DZSUM1 forms the 1-norm of the complex vector using the true absolute value.

Purpose:

!>
!> DZSUM1 takes the sum of the absolute values of a complex
!> vector and returns a double precision result.
!>
!> Based on DZASUM from the Level 1 BLAS.
!> The change is to use the 'genuine' absolute value.
!>

Parameters

!>          N is INTEGER
!>          The number of elements in the vector CX.
!>

!>          CX is COMPLEX*16 array, dimension (N)
!>          The vector whose elements will be summed.
!>

INCX

!>          INCX is INTEGER
!>          The spacing between successive values of CX.  INCX > 0.
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Contributors:

Nick Higham for use with ZLACON.

Definition at line 80 of file dzsum1.f.

real function SCSUM1 (integer n, complex, dimension( * ) cx, integer incx)¶

SCSUM1 forms the 1-norm of the complex vector using the true absolute value.