SRC/izmax1.c File Reference

Finds the index of the element whose real part has maximum absolute value. More...

#include <math.h>
#include "slu_dcomplex.h"
#include "slu_Cnames.h"

Defines
#define	CX(I)   cx[(I)-1]
Functions
int	izmax1_ (int *n, doublecomplex *cx, int *incx)

---

Detailed Description

     -- 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

int izmax1_	(	int *	n,
		doublecomplex *	cx,
		int *	incx
	)

    Purpose   
    =======

    IZMAX1 finds the index of the element whose real part has maximum   
    absolute value.

    Based on IZAMAX from 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 >= 1.

   =====================================================================