version 1.16, 2017/06/17 11:06:23
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version 1.17, 2018/05/29 06:55:17
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*> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
*> \author NAG Ltd. |
*> \author NAG Ltd. |
* |
* |
*> \date December 2016 |
*> \date June 2017 |
* |
* |
*> \ingroup OTHERauxiliary |
*> \ingroup OTHERauxiliary |
* |
* |
* ===================================================================== |
* ===================================================================== |
DOUBLE PRECISION FUNCTION DLAPY2( X, Y ) |
DOUBLE PRECISION FUNCTION DLAPY2( X, Y ) |
* |
* |
* -- LAPACK auxiliary routine (version 3.7.0) -- |
* -- LAPACK auxiliary routine (version 3.7.1) -- |
* -- 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..-- |
* December 2016 |
* June 2017 |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
DOUBLE PRECISION X, Y |
DOUBLE PRECISION X, Y |
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* .. |
* .. |
* .. Local Scalars .. |
* .. Local Scalars .. |
DOUBLE PRECISION W, XABS, YABS, Z |
DOUBLE PRECISION W, XABS, YABS, Z |
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LOGICAL X_IS_NAN, Y_IS_NAN |
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* .. |
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* .. External Functions .. |
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LOGICAL DISNAN |
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EXTERNAL DISNAN |
* .. |
* .. |
* .. 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 |
* |
DLAPY2 = W |
IF ( .NOT.( X_IS_NAN.OR.Y_IS_NAN ) ) THEN |
ELSE |
XABS = ABS( X ) |
DLAPY2 = W*SQRT( ONE+( Z / W )**2 ) |
YABS = ABS( Y ) |
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W = MAX( XABS, YABS ) |
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Z = MIN( XABS, YABS ) |
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IF( Z.EQ.ZERO ) THEN |
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DLAPY2 = W |
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ELSE |
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DLAPY2 = W*SQRT( ONE+( Z / W )**2 ) |
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END IF |
END IF |
END IF |
RETURN |
RETURN |
* |
* |