--- rpl/lapack/lapack/dlapy2.f 2011/11/21 20:42:56 1.8
+++ rpl/lapack/lapack/dlapy2.f 2018/05/29 06:55:17 1.17
@@ -1,29 +1,29 @@
-*> \brief \b DLAPY2
+*> \brief \b DLAPY2 returns sqrt(x2+y2).
*
* =========== DOCUMENTATION ===========
*
-* Online html documentation available at
-* http://www.netlib.org/lapack/explore-html/
+* Online html documentation available at
+* http://www.netlib.org/lapack/explore-html/
*
*> \htmlonly
-*> Download DLAPY2 + dependencies
-*>
-*> [TGZ]
-*>
-*> [ZIP]
-*>
+*> Download DLAPY2 + dependencies
+*>
+*> [TGZ]
+*>
+*> [ZIP]
+*>
*> [TXT]
-*> \endhtmlonly
+*> \endhtmlonly
*
* Definition:
* ===========
*
* DOUBLE PRECISION FUNCTION DLAPY2( X, Y )
-*
+*
* .. Scalar Arguments ..
* DOUBLE PRECISION X, Y
* ..
-*
+*
*
*> \par Purpose:
* =============
@@ -51,22 +51,22 @@
* Authors:
* ========
*
-*> \author Univ. of Tennessee
-*> \author Univ. of California Berkeley
-*> \author Univ. of Colorado Denver
-*> \author NAG Ltd.
+*> \author Univ. of Tennessee
+*> \author Univ. of California Berkeley
+*> \author Univ. of Colorado Denver
+*> \author NAG Ltd.
*
-*> \date November 2011
+*> \date June 2017
*
-*> \ingroup auxOTHERauxiliary
+*> \ingroup OTHERauxiliary
*
* =====================================================================
DOUBLE PRECISION FUNCTION DLAPY2( X, Y )
*
-* -- LAPACK auxiliary routine (version 3.4.0) --
+* -- LAPACK auxiliary routine (version 3.7.1) --
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-* November 2011
+* June 2017
*
* .. Scalar Arguments ..
DOUBLE PRECISION X, Y
@@ -82,20 +82,32 @@
* ..
* .. Local Scalars ..
DOUBLE PRECISION W, XABS, YABS, Z
+ LOGICAL X_IS_NAN, Y_IS_NAN
+* ..
+* .. External Functions ..
+ LOGICAL DISNAN
+ EXTERNAL DISNAN
* ..
* .. 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
- DLAPY2 = W
- ELSE
- DLAPY2 = W*SQRT( ONE+( Z / W )**2 )
+ X_IS_NAN = DISNAN( X )
+ Y_IS_NAN = DISNAN( Y )
+ IF ( X_IS_NAN ) DLAPY2 = X
+ IF ( Y_IS_NAN ) DLAPY2 = Y
+*
+ IF ( .NOT.( X_IS_NAN.OR.Y_IS_NAN ) ) THEN
+ XABS = ABS( X )
+ YABS = ABS( Y )
+ W = MAX( XABS, YABS )
+ Z = MIN( XABS, YABS )
+ IF( Z.EQ.ZERO ) THEN
+ DLAPY2 = W
+ ELSE
+ DLAPY2 = W*SQRT( ONE+( Z / W )**2 )
+ END IF
END IF
RETURN
*