|
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 |
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 |