[BACK]Return to dlapy2.f CVS log [TXT] [DIR] Up to [local] / rpl / lapack / lapack

Diff for /rpl/lapack/lapack/dlapy2.f between versions 1.14 and 1.19

version 1.14, 2016/08/27 15:34:28 version 1.19, 2023/08/07 08:38:55
Line 2 Line 2
 *  *
 *  =========== DOCUMENTATION ===========  *  =========== DOCUMENTATION ===========
 *  *
 * Online html documentation available at   * Online html documentation available at
 *            http://www.netlib.org/lapack/explore-html/   *            http://www.netlib.org/lapack/explore-html/
 *  *
 *> \htmlonly  *> \htmlonly
 *> Download DLAPY2 + dependencies   *> Download DLAPY2 + dependencies
 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlapy2.f">   *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlapy2.f">
 *> [TGZ]</a>   *> [TGZ]</a>
 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlapy2.f">   *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlapy2.f">
 *> [ZIP]</a>   *> [ZIP]</a>
 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlapy2.f">   *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlapy2.f">
 *> [TXT]</a>  *> [TXT]</a>
 *> \endhtmlonly   *> \endhtmlonly
 *  *
 *  Definition:  *  Definition:
 *  ===========  *  ===========
 *  *
 *       DOUBLE PRECISION FUNCTION DLAPY2( X, Y )  *       DOUBLE PRECISION FUNCTION DLAPY2( X, Y )
 *   *
 *       .. Scalar Arguments ..  *       .. Scalar Arguments ..
 *       DOUBLE PRECISION   X, Y  *       DOUBLE PRECISION   X, Y
 *       ..  *       ..
 *    *
 *  *
 *> \par Purpose:  *> \par Purpose:
 *  =============  *  =============
Line 31 Line 31
 *> \verbatim  *> \verbatim
 *>  *>
 *> DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary  *> DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary
 *> overflow.  *> overflow and unnecessary underflow.
 *> \endverbatim  *> \endverbatim
 *  *
 *  Arguments:  *  Arguments:
Line 51 Line 51
 *  Authors:  *  Authors:
 *  ========  *  ========
 *  *
 *> \author Univ. of Tennessee   *> \author Univ. of Tennessee
 *> \author Univ. of California Berkeley   *> \author Univ. of California Berkeley
 *> \author Univ. of Colorado Denver   *> \author Univ. of Colorado Denver
 *> \author NAG Ltd.   *> \author NAG Ltd.
 *  
 *> \date September 2012  
 *  *
 *> \ingroup auxOTHERauxiliary  *> \ingroup OTHERauxiliary
 *  *
 *  =====================================================================  *  =====================================================================
       DOUBLE PRECISION FUNCTION DLAPY2( X, Y )        DOUBLE PRECISION FUNCTION DLAPY2( X, Y )
 *  *
 *  -- LAPACK auxiliary routine (version 3.4.2) --  *  -- LAPACK auxiliary routine --
 *  -- LAPACK is a software package provided by Univ. of Tennessee,    --  *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--  *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
 *     September 2012  
 *  *
 *     .. Scalar Arguments ..  *     .. Scalar Arguments ..
       DOUBLE PRECISION   X, Y        DOUBLE PRECISION   X, Y
Line 81 Line 78
       PARAMETER          ( ONE = 1.0D0 )        PARAMETER          ( ONE = 1.0D0 )
 *     ..  *     ..
 *     .. Local Scalars ..  *     .. Local Scalars ..
       DOUBLE PRECISION   W, XABS, YABS, Z        DOUBLE PRECISION   W, XABS, YABS, Z, HUGEVAL
         LOGICAL            X_IS_NAN, Y_IS_NAN
   *     ..
   *     .. External Functions ..
         LOGICAL            DISNAN
         EXTERNAL           DISNAN
   *     ..
   *     .. External Subroutines ..
         DOUBLE PRECISION   DLAMCH
 *     ..  *     ..
 *     .. Intrinsic Functions ..  *     .. Intrinsic Functions ..
       INTRINSIC          ABS, MAX, MIN, SQRT        INTRINSIC          ABS, MAX, MIN, SQRT
 *     ..  *     ..
 *     .. Executable Statements ..  *     .. Executable Statements ..
 *  *
       XABS = ABS( X )        X_IS_NAN = DISNAN( X )
       YABS = ABS( Y )        Y_IS_NAN = DISNAN( Y )
       W = MAX( XABS, YABS )        IF ( X_IS_NAN ) DLAPY2 = X
       Z = MIN( XABS, YABS )        IF ( Y_IS_NAN ) DLAPY2 = Y
       IF( Z.EQ.ZERO ) THEN        HUGEVAL = DLAMCH( 'Overflow' )
          DLAPY2 = W  *
       ELSE        IF ( .NOT.( X_IS_NAN.OR.Y_IS_NAN ) ) THEN
          DLAPY2 = W*SQRT( ONE+( Z / W )**2 )           XABS = ABS( X )
            YABS = ABS( Y )
            W = MAX( XABS, YABS )
            Z = MIN( XABS, YABS )
            IF( Z.EQ.ZERO .OR. W.GT.HUGEVAL ) THEN
               DLAPY2 = W
            ELSE
               DLAPY2 = W*SQRT( ONE+( Z / W )**2 )
            END IF
       END IF        END IF
       RETURN        RETURN
 *  *
Removed from v.1.14  
changed lines
  Added in v.1.19

CVSweb interface <joel.bertrand@systella.fr>