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+*> \brief \b SLAPY2
+*
+* =========== DOCUMENTATION ===========
+*
+* Online html documentation available at
+* http://www.netlib.org/lapack/explore-html/
+*
+*> \htmlonly
+*> Download SLAPY2 + dependencies
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/slapy2.f">
+*> [TGZ]</a>
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/slapy2.f">
+*> [ZIP]</a>
+*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/slapy2.f">
+*> [TXT]</a>
+*> \endhtmlonly
+*
+* Definition:
+* ===========
+*
+* REAL FUNCTION SLAPY2( X, Y )
+*
+* .. Scalar Arguments ..
+* REAL X, Y
+* ..
+*
+*
+*> \par Purpose:
+* =============
+*>
+*> \verbatim
+*>
+*> SLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary
+*> overflow.
+*> \endverbatim
+*
+* Arguments:
+* ==========
+*
+*> \param[in] X
+*> \verbatim
+*> X is REAL
+*> \endverbatim
+*>
+*> \param[in] Y
+*> \verbatim
+*> Y is REAL
+*> 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 November 2011
+*
+*> \ingroup auxOTHERauxiliary
+*
+* =====================================================================
+ REAL FUNCTION SLAPY2( X, Y )
+*
+* -- LAPACK auxiliary routine (version 3.4.0) --
+* -- LAPACK is a software package provided by Univ. of Tennessee, --
+* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
+* November 2011
+*
+* .. Scalar Arguments ..
+ REAL X, Y
+* ..
+*
+* =====================================================================
+*
+* .. Parameters ..
+ REAL ZERO
+ PARAMETER ( ZERO = 0.0E0 )
+ REAL ONE
+ PARAMETER ( ONE = 1.0E0 )
+* ..
+* .. Local Scalars ..
+ REAL W, XABS, YABS, Z
+* ..
+* .. Intrinsic Functions ..
+ INTRINSIC ABS, MAX, MIN, SQRT
+* ..
+* .. Executable Statements ..
+*
+ XABS = ABS( X )
+ YABS = ABS( Y )
+ W = MAX( XABS, YABS )
+ Z = MIN( XABS, YABS )
+ IF( Z.EQ.ZERO ) THEN
+ SLAPY2 = W
+ ELSE
+ SLAPY2 = W*SQRT( ONE+( Z / W )**2 )
+ END IF
+ RETURN
+*
+* End of SLAPY2
+*
+ END