108 lines
2.2 KiB
Fortran
108 lines
2.2 KiB
Fortran
*> \brief \b CGENND
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*
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* =========== DOCUMENTATION ===========
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*
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* Online html documentation available at
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* http://www.netlib.org/lapack/explore-html/
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*
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* Definition:
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* ===========
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*
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* LOGICAL FUNCTION CGENND (M, N, A, LDA)
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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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* COMPLEX A( LDA, * )
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* ..
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*
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*
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*> \par Purpose:
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* =============
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*>
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*> \verbatim
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*>
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*> CGENND tests that its argument has a real, non-negative diagonal.
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*> \endverbatim
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*
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* Arguments:
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* ==========
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*
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*> \param[in] M
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*> \verbatim
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*> M is INTEGER
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*> The number of rows in A.
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*> \endverbatim
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*>
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*> \param[in] N
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*> \verbatim
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*> N is INTEGER
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*> The number of columns in A.
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*> \endverbatim
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*>
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*> \param[in] A
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*> \verbatim
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*> A is COMPLEX array, dimension (LDA, N)
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*> The matrix.
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*> \endverbatim
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*>
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*> \param[in] LDA
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*> \verbatim
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*> LDA is INTEGER
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*> Leading dimension of A.
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*> \endverbatim
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*
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* Authors:
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* ========
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*
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*> \author Univ. of Tennessee
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*> \author Univ. of California Berkeley
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*> \author Univ. of Colorado Denver
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*> \author NAG Ltd.
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*
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*> \date November 2011
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*
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*> \ingroup complex_lin
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*
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* =====================================================================
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LOGICAL FUNCTION CGENND (M, N, A, LDA)
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*
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* -- LAPACK test routine (version 3.4.0) --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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* November 2011
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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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COMPLEX A( LDA, * )
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* ..
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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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COMPLEX AII
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* ..
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* .. Intrinsics ..
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INTRINSIC MIN, REAL, AIMAG
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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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AII = A( I, I )
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IF( REAL( AII ).LT.ZERO.OR.AIMAG( AII ).NE.ZERO ) THEN
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CGENND = .FALSE.
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RETURN
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END IF
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END DO
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CGENND = .TRUE.
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RETURN
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END
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