#include "blaswrap.h"
#include "f2c.h"

integer icmax1_(integer *n, complex *cx, integer *incx)
{
/*  -- LAPACK auxiliary routine (version 3.1) --   
       Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..   
       November 2006   


    Purpose   
    =======   

    ICMAX1 finds the index of the element whose real part has maximum   
    absolute value.   

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

    Contributed by Nick Higham for use with CLACON.   

    Arguments   
    =========   

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

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

    INCX    (input) INTEGER   
            The spacing between successive values of CX.  INCX >= 1.   

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


       NEXT LINE IS THE ONLY MODIFICATION.   

       Parameter adjustments */
    /* System generated locals */
    integer ret_val, i__1;
    /* Builtin functions */
    double c_abs(complex *);
    /* Local variables */
    static integer i__, ix;
    static real smax;

    --cx;

    /* Function Body */
    ret_val = 0;
    if (*n < 1) {
	return ret_val;
    }
    ret_val = 1;
    if (*n == 1) {
	return ret_val;
    }
    if (*incx == 1) {
	goto L30;
    }

/*     CODE FOR INCREMENT NOT EQUAL TO 1 */

    ix = 1;
    smax = c_abs(&cx[1]);
    ix += *incx;
    i__1 = *n;
    for (i__ = 2; i__ <= i__1; ++i__) {
	if (c_abs(&cx[ix]) <= smax) {
	    goto L10;
	}
	ret_val = i__;
	smax = c_abs(&cx[ix]);
L10:
	ix += *incx;
/* L20: */
    }
    return ret_val;

/*     CODE FOR INCREMENT EQUAL TO 1 */

L30:
    smax = c_abs(&cx[1]);
    i__1 = *n;
    for (i__ = 2; i__ <= i__1; ++i__) {
	if (c_abs(&cx[i__]) <= smax) {
	    goto L40;
	}
	ret_val = i__;
	smax = c_abs(&cx[i__]);
L40:
	;
    }
    return ret_val;

/*     End of ICMAX1 */

} /* icmax1_ */