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"

Include dependency graph for izmax1.c:

Macros
#define	CX(I)   cx[(I)-1]

Functions
int	izmax1_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

int izmax1_slu	(	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.