/* -- translated by f2c (version 20100827).
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*/
#include "f2c.h"
/* > \brief \b DLAPY2 returns sqrt(x2+y2).
=========== DOCUMENTATION ===========
Online html documentation available at
http://www.netlib.org/lapack/explore-html/
> \htmlonly
> Download DLAPY2 + dependencies
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f">
> [TGZ]</a>
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> [ZIP]</a>
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlapy2.
f">
> [TXT]</a>
> \endhtmlonly
Definition:
===========
DOUBLE PRECISION FUNCTION DLAPY2( X, Y )
DOUBLE PRECISION X, Y
> \par Purpose:
=============
>
> \verbatim
>
> DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary
> overflow.
> \endverbatim
Arguments:
==========
> \param[in] X
> \verbatim
> X is DOUBLE PRECISION
> \endverbatim
>
> \param[in] Y
> \verbatim
> Y is DOUBLE PRECISION
> X and Y specify the values x and y.
> \endverbatim
Authors:
========
> \author Univ. of Tennessee
> \author Univ. of California Berkeley
> \author Univ. of Colorado Denver
> \author NAG Ltd.
> \date September 2012
> \ingroup auxOTHERauxiliary
===================================================================== */
doublereal igraphdlapy2_(doublereal *x, doublereal *y)
{
/* System generated locals */
doublereal ret_val, d__1;
/* Builtin functions */
double sqrt(doublereal);
/* Local variables */
doublereal w, z__, xabs, yabs;
/* -- LAPACK auxiliary routine (version 3.4.2) --
-- LAPACK is a software package provided by Univ. of Tennessee, --
-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
September 2012
===================================================================== */
xabs = abs(*x);
yabs = abs(*y);
w = max(xabs,yabs);
z__ = min(xabs,yabs);
if (z__ == 0.) {
ret_val = w;
} else {
/* Computing 2nd power */
d__1 = z__ / w;
ret_val = w * sqrt(d__1 * d__1 + 1.);
}
return ret_val;
/* End of DLAPY2 */
} /* igraphdlapy2_ */