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