LOGICAL FUNCTION SGENND (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 .. REAL A( LDA, * ) * .. * * Purpose * ======= * * SGENND tests that its argument has a non-negative diagonal. * * Arguments * ========= * * M (input) INTEGER * The number of rows in A. * * N (input) INTEGER * The number of columns in A. * * A (input) REAL array, dimension (LDA, N) * The matrix. * * LDA (input) INTEGER * Leading dimension of A. * * ===================================================================== * * .. Parameters .. REAL ZERO PARAMETER ( ZERO = 0.0E0 ) * .. * .. Local Scalars .. INTEGER I, K * .. * .. Intrinsics .. INTRINSIC MIN * .. * .. Executable Statements .. K = MIN( M, N ) DO I = 1, K IF( A( I, I ).LT.ZERO ) THEN SGENND = .FALSE. RETURN END IF END DO SGENND = .TRUE. RETURN END