clctes()

logical function clctes	(	complex	z,
		complex	d )

CLCTES

Purpose:

!>
!> 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.
!> 

Parameters

[in]	Z	!> Z is COMPLEX !> The numerator part of a complex eigenvalue Z/D. !>
[in]	D	!> D is COMPLEX !> The denominator part of a complex eigenvalue Z/D. !>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 57 of file clctes.f.

*
*  -- LAPACK test routine --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*     .. 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
*

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