/*  -- translated by f2c (version 19940927).

   You must link the resulting object file with the libraries:

	-lf2c -lm   (in that order)

*/

#include "f2c.h"

doublereal dnrm2_(integer *n, doublereal *x, integer *incx)

{

    /* System generated locals */

    integer i__1, i__2;

    doublereal ret_val, d__1;

    /* Builtin functions */

    double sqrt(doublereal);

    /* Local variables */

    static doublereal norm, scale, absxi;

    static integer ix;

    static doublereal ssq;

/*  DNRM2 returns the euclidean norm of a vector via the function   

    name, so that   

       DNRM2 := sqrt( x'*x )   

    -- This version written on 25-October-1982.   

       Modified on 14-October-1993 to inline the call to DLASSQ.   

       Sven Hammarling, Nag Ltd.   

   Parameter adjustments   

       Function Body */

#define X(I) x[(I)-1]

    if (*n < 1 || *incx < 1) {

	norm = 0.;

    } else if (*n == 1) {

	norm = abs(X(1));

    } else {

	scale = 0.;

	ssq = 1.;

/*        The following loop is equivalent to this call to the LAPACK 

          auxiliary routine:   

          CALL DLASSQ( N, X, INCX, SCALE, SSQ ) */

	i__1 = (*n - 1) * *incx + 1;

	i__2 = *incx;

	for (ix = 1; *incx < 0 ? ix >= (*n-1)**incx+1 : ix <= (*n-1)**incx+1; ix += *incx) {

	    if (X(ix) != 0.) {

		absxi = (d__1 = X(ix), abs(d__1));

		if (scale < absxi) {

/* Computing 2nd power */

		    d__1 = scale / absxi;

		    ssq = ssq * (d__1 * d__1) + 1.;

		    scale = absxi;

		} else {

/* Computing 2nd power */

		    d__1 = absxi / scale;

		    ssq += d__1 * d__1;

		}

	    }

/* L10: */

	}

	norm = scale * sqrt(ssq);

    }

    ret_val = norm;

    return ret_val;

/*     End of DNRM2. */

} /* dnrm2_ */