lsd_mkb/lsd_mkb_superlu/superlu_seq/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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Defines
#define	CX(I)   cx[(I)-1]
Functions
double	dzsum1_ (int *n, doublecomplex *cx, int *incx)

---

Detailed Description

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

     -- 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   
 

---

Define Documentation

#define CX

(

I

)

cx[(I)-1]

---

Function Documentation

double dzsum1_	(	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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