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123 lines
2.7 KiB
123 lines
2.7 KiB
2 years ago
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*> \brief \b SLCTSX
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*
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* =========== DOCUMENTATION ===========
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*
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* Online html documentation available at
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* http://www.netlib.org/lapack/explore-html/
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*
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* Definition:
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* ===========
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*
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* LOGICAL FUNCTION SLCTSX( AR, AI, BETA )
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*
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* .. Scalar Arguments ..
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* REAL AI, AR, BETA
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* ..
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*
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*
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*> \par Purpose:
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* =============
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*>
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*> \verbatim
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*>
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*> This function is used to determine what eigenvalues will be
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*> selected. If this is part of the test driver SDRGSX, do not
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*> change the code UNLESS you are testing input examples and not
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*> using the built-in examples.
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*> \endverbatim
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*
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* Arguments:
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* ==========
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*
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*> \param[in] AR
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*> \verbatim
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*> AR is REAL
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*> The numerator of the real part of a complex eigenvalue
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*> (AR/BETA) + i*(AI/BETA).
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*> \endverbatim
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*>
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*> \param[in] AI
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*> \verbatim
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*> AI is REAL
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*> The numerator of the imaginary part of a complex eigenvalue
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*> (AR/BETA) + i*(AI).
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*> \endverbatim
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*>
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*> \param[in] BETA
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*> \verbatim
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*> BETA is REAL
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*> The denominator part of a complex eigenvalue
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*> (AR/BETA) + i*(AI/BETA).
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*> \endverbatim
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*
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* Authors:
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* ========
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*
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*> \author Univ. of Tennessee
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*> \author Univ. of California Berkeley
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*> \author Univ. of Colorado Denver
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*> \author NAG Ltd.
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*
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*> \ingroup single_eig
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*
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* =====================================================================
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LOGICAL FUNCTION SLCTSX( AR, AI, BETA )
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*
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* -- LAPACK test routine --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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*
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* .. Scalar Arguments ..
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REAL AI, AR, BETA
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* ..
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*
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* =====================================================================
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*
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* .. Scalars in Common ..
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LOGICAL FS
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INTEGER I, M, MPLUSN, N
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* ..
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* .. Common blocks ..
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COMMON / MN / M, N, MPLUSN, I, FS
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* ..
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* .. Save statement ..
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SAVE
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* ..
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* .. Executable Statements ..
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*
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IF( FS ) THEN
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I = I + 1
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IF( I.LE.M ) THEN
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SLCTSX = .FALSE.
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ELSE
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SLCTSX = .TRUE.
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END IF
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IF( I.EQ.MPLUSN ) THEN
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FS = .FALSE.
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I = 0
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END IF
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ELSE
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I = I + 1
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IF( I.LE.N ) THEN
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SLCTSX = .TRUE.
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ELSE
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SLCTSX = .FALSE.
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END IF
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IF( I.EQ.MPLUSN ) THEN
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FS = .TRUE.
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I = 0
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END IF
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END IF
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*
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* IF( AR/BETA.GT.0.0 )THEN
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* SLCTSX = .TRUE.
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* ELSE
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* SLCTSX = .FALSE.
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* END IF
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*
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RETURN
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*
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* End of SLCTSX
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*
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END
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