dzsum1.c File Reference

Takes sum of the absolute values of a complex vector and returns a double precision result. More...

#include "slu_dcomplex.h"
#include "slu_Cnames.h"

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Macros
#define	CX(I)   cx[(I)-1]

Functions
double	dzsum1_slu (int *n, doublecomplex *cx, int *incx)

Detailed Description

Copyright (c) 2003, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from U.S. Dept. of Energy)

All rights reserved.

The source code is distributed under BSD license, see the file License.txt at the top-level directory.

    – LAPACK auxiliary routine (version 2.0) –   
    Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
    Courant Institute, Argonne National Lab, and Rice University   
    October 31, 1992   

Macro Definition Documentation

#define CX

(

I

)

cx[(I)-1]

Function Documentation

double dzsum1_slu	(	int *	n,
		doublecomplex *	cx,
		int *	incx
	)

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.

    Contributed by Nick Higham for use with ZLACON.

Arguments   

    N       (input) INT   
            The number of elements in the vector CX.

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

    INCX    (input) INT   
            The spacing between successive values of CX.  INCX > 0.   

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