slctsx()

logical function slctsx	(	real	ar,
		real	ai,
		real	beta )

SLCTSX

Purpose:

!>
!> This function is used to determine what eigenvalues will be
!> selected.  If this is part of the test driver SDRGSX, do not
!> change the code UNLESS you are testing input examples and not
!> using the built-in examples.
!> 

Parameters

[in]	AR	!> AR is REAL !> The numerator of the real part of a complex eigenvalue !> (AR/BETA) + i*(AI/BETA). !>
[in]	AI	!> AI is REAL !> The numerator of the imaginary part of a complex eigenvalue !> (AR/BETA) + i*(AI). !>
[in]	BETA	!> BETA is REAL !> The denominator part of a complex eigenvalue !> (AR/BETA) + i*(AI/BETA). !>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 64 of file slctsx.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 ..
      REAL               AI, AR, BETA
*     ..
*
*  =====================================================================
*
*     .. Scalars in Common ..
      LOGICAL            FS
      INTEGER            I, M, MPLUSN, N
*     ..
*     .. Common blocks ..
      COMMON             / mn / m, n, mplusn, i, fs
*     ..
*     .. Save statement ..
      SAVE
*     ..
*     .. Executable Statements ..
*
      IF( fs ) THEN
         i = i + 1
         IF( i.LE.m ) THEN
            slctsx = .false.
         ELSE
            slctsx = .true.
         END IF
         IF( i.EQ.mplusn ) THEN
            fs = .false.
            i = 0
         END IF
      ELSE
         i = i + 1
         IF( i.LE.n ) THEN
            slctsx = .true.
         ELSE
            slctsx = .false.
         END IF
         IF( i.EQ.mplusn ) THEN
            fs = .true.
            i = 0
         END IF
      END IF
*
*       IF( AR/BETA.GT.0.0 )THEN
*          SLCTSX = .TRUE.
*       ELSE
*          SLCTSX = .FALSE.
*       END IF
*
      RETURN
*
*     End of SLCTSX
*

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