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LOGICAL FUNCTION ZGENND (M, N, A, LDA)
IMPLICIT NONE * * -- LAPACK test routine (version 3.1) -- * Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. * February 2008 * * .. Scalar Arguments .. INTEGER M, N, LDA * .. * .. Array Arguments .. COMPLEX*16 A( LDA, * ) * .. * * Purpose * ======= * * ZGENND tests that its argument has a real, non-negative diagonal. * * Arguments * ========= * * M (input) INTEGER * The number of rows in A. * * N (input) INTEGER * The number of columns in A. * * A (input) COMPLEX*16 array, dimension (LDA, N) * The matrix. * * LDA (input) INTEGER * Leading dimension of A. * * ===================================================================== * * .. Parameters .. REAL ZERO PARAMETER ( ZERO = 0.0E0 ) * .. * .. Local Scalars .. LOGICAL OUT INTEGER I, K COMPLEX*16 AII * .. * .. Intrinsics .. INTRINSIC MIN, DBLE, DIMAG * .. * .. Executable Statements .. K = MIN( M, N ) DO I = 1, K AII = A( I, I ) IF( DBLE( AII ).LT.ZERO.OR.DIMAG( AII ).NE.ZERO ) THEN ZGENND = .FALSE. RETURN END IF END DO ZGENND = .TRUE. RETURN END |