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*> \brief \b CLCTES
*
* =========== DOCUMENTATION ===========
*
* Online html documentation available at
* http://www.netlib.org/lapack/explore-html/
*
* Definition:
* ===========
*
* LOGICAL FUNCTION CLCTES( Z, D )
*
* .. Scalar Arguments ..
* COMPLEX D, Z
* ..
*
*
*> \par Purpose:
* =============
*>
*> \verbatim
*>
*> CLCTES returns .TRUE. if the eigenvalue Z/D is to be selected
*> (specifically, in this subroutine, if the real part of the
*> eigenvalue is negative), and otherwise it returns .FALSE..
*>
*> It is used by the test routine CDRGES to test whether the driver
*> routine CGGES successfully sorts eigenvalues.
*> \endverbatim
*
* Arguments:
* ==========
*
*> \param[in] Z
*> \verbatim
*> Z is COMPLEX
*> The numerator part of a complex eigenvalue Z/D.
*> \endverbatim
*>
*> \param[in] D
*> \verbatim
*> D is COMPLEX
*> The denominator part of a complex eigenvalue Z/D.
*> \endverbatim
*
* Authors:
* ========
*
*> \author Univ. of Tennessee
*> \author Univ. of California Berkeley
*> \author Univ. of Colorado Denver
*> \author NAG Ltd.
*
*> \date November 2011
*
*> \ingroup complex_eig
*
* =====================================================================
LOGICAL FUNCTION CLCTES( Z, D )
*
* -- LAPACK test 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 ..
COMPLEX D, Z
* ..
*
* =====================================================================
*
* .. Parameters ..
*
REAL ZERO, ONE
PARAMETER ( ZERO = 0.0E+0, ONE = 1.0E+0 )
COMPLEX CZERO
PARAMETER ( CZERO = ( 0.0E+0, 0.0E+0 ) )
* ..
* .. Local Scalars ..
REAL ZMAX
* ..
* .. Intrinsic Functions ..
INTRINSIC ABS, AIMAG, MAX, REAL, SIGN
* ..
* .. Executable Statements ..
*
IF( D.EQ.CZERO ) THEN
CLCTES = ( REAL( Z ).LT.ZERO )
ELSE
IF( REAL( Z ).EQ.ZERO .OR. REAL( D ).EQ.ZERO ) THEN
CLCTES = ( SIGN( ONE, AIMAG( Z ) ).NE.
$ SIGN( ONE, AIMAG( D ) ) )
ELSE IF( AIMAG( Z ).EQ.ZERO .OR. AIMAG( D ).EQ.ZERO ) THEN
CLCTES = ( SIGN( ONE, REAL( Z ) ).NE.
$ SIGN( ONE, REAL( D ) ) )
ELSE
ZMAX = MAX( ABS( REAL( Z ) ), ABS( AIMAG( Z ) ) )
CLCTES = ( ( REAL( Z ) / ZMAX )*REAL( D )+
$ ( AIMAG( Z ) / ZMAX )*AIMAG( D ).LT.ZERO )
END IF
END IF
*
RETURN
*
* End of CLCTES
*
END
|
