LOGICAL FUNCTION SLCTSX( AR, AI, BETA ) * * -- LAPACK test routine (version 3.1) -- * Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. * November 2006 * * .. Scalar Arguments .. REAL AI, AR, BETA * .. * * 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. * * Arguments * ========= * * AR (input) REAL * The numerator of the real part of a complex eigenvalue * (AR/BETA) + i*(AI/BETA). * * AI (input) REAL * The numerator of the imaginary part of a complex eigenvalue * (AR/BETA) + i*(AI). * * BETA (input) REAL * The denominator part of a complex eigenvalue * (AR/BETA) + i*(AI/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 * END