Man page - sum1(3)

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Manual

sum1

NAME
SYNOPSIS
Functions
Detailed Description
Function Documentation
double precision function dzsum1 (integer n, complex*16, dimension( * ) cx,integer incx)
real function scsum1 (integer n, complex, dimension( * ) cx, integer incx)
Author

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, complex*16, 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

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

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.

real function scsum1 (integer n, complex, dimension( * ) cx, integer incx)

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

Purpose:

SCSUM1 takes the sum of the absolute values of a complex
vector and returns a single precision result.

Based on SCASUM from the Level 1 BLAS.
The change is to use the ’genuine’ absolute value.

Parameters

N

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

CX

CX is COMPLEX 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 CLACON.

Author

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