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316 lines
8.3 KiB
316 lines
8.3 KiB
2 years ago
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*> \brief \b CGET22
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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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* SUBROUTINE CGET22( TRANSA, TRANSE, TRANSW, N, A, LDA, E, LDE, W,
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* WORK, RWORK, RESULT )
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*
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* .. Scalar Arguments ..
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* CHARACTER TRANSA, TRANSE, TRANSW
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* INTEGER LDA, LDE, N
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* ..
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* .. Array Arguments ..
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* REAL RESULT( 2 ), RWORK( * )
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* COMPLEX A( LDA, * ), E( LDE, * ), W( * ), WORK( * )
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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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*> CGET22 does an eigenvector check.
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*>
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*> The basic test is:
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*>
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*> RESULT(1) = | A E - E W | / ( |A| |E| ulp )
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*>
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*> using the 1-norm. It also tests the normalization of E:
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*>
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*> RESULT(2) = max | m-norm(E(j)) - 1 | / ( n ulp )
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*> j
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*>
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*> where E(j) is the j-th eigenvector, and m-norm is the max-norm of a
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*> vector. The max-norm of a complex n-vector x in this case is the
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*> maximum of |re(x(i)| + |im(x(i)| over i = 1, ..., n.
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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] TRANSA
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*> \verbatim
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*> TRANSA is CHARACTER*1
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*> Specifies whether or not A is transposed.
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*> = 'N': No transpose
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*> = 'T': Transpose
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*> = 'C': Conjugate transpose
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*> \endverbatim
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*>
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*> \param[in] TRANSE
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*> \verbatim
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*> TRANSE is CHARACTER*1
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*> Specifies whether or not E is transposed.
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*> = 'N': No transpose, eigenvectors are in columns of E
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*> = 'T': Transpose, eigenvectors are in rows of E
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*> = 'C': Conjugate transpose, eigenvectors are in rows of E
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*> \endverbatim
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*>
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*> \param[in] TRANSW
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*> \verbatim
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*> TRANSW is CHARACTER*1
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*> Specifies whether or not W is transposed.
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*> = 'N': No transpose
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*> = 'T': Transpose, same as TRANSW = 'N'
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*> = 'C': Conjugate transpose, use -WI(j) instead of WI(j)
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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 order of the matrix A. N >= 0.
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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 whose eigenvectors are in E.
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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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*> The leading dimension of the array A. LDA >= max(1,N).
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*> \endverbatim
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*>
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*> \param[in] E
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*> \verbatim
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*> E is COMPLEX array, dimension (LDE,N)
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*> The matrix of eigenvectors. If TRANSE = 'N', the eigenvectors
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*> are stored in the columns of E, if TRANSE = 'T' or 'C', the
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*> eigenvectors are stored in the rows of E.
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*> \endverbatim
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*>
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*> \param[in] LDE
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*> \verbatim
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*> LDE is INTEGER
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*> The leading dimension of the array E. LDE >= max(1,N).
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*> \endverbatim
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*>
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*> \param[in] W
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*> \verbatim
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*> W is COMPLEX array, dimension (N)
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*> The eigenvalues of A.
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*> \endverbatim
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*>
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*> \param[out] WORK
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*> \verbatim
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*> WORK is COMPLEX array, dimension (N*N)
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*> \endverbatim
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*>
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*> \param[out] RWORK
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*> \verbatim
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*> RWORK is REAL array, dimension (N)
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*> \endverbatim
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*>
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*> \param[out] RESULT
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*> \verbatim
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*> RESULT is REAL array, dimension (2)
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*> RESULT(1) = | A E - E W | / ( |A| |E| ulp )
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*> RESULT(2) = max | m-norm(E(j)) - 1 | / ( n ulp )
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*> j
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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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*> \ingroup complex_eig
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*
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* =====================================================================
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SUBROUTINE CGET22( TRANSA, TRANSE, TRANSW, N, A, LDA, E, LDE, W,
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$ WORK, RWORK, RESULT )
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*
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* -- LAPACK test routine --
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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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*
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* .. Scalar Arguments ..
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CHARACTER TRANSA, TRANSE, TRANSW
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INTEGER LDA, LDE, N
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* ..
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* .. Array Arguments ..
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REAL RESULT( 2 ), RWORK( * )
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COMPLEX A( LDA, * ), E( LDE, * ), W( * ), WORK( * )
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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, ONE
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PARAMETER ( ZERO = 0.0E+0, ONE = 1.0E+0 )
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COMPLEX CZERO, CONE
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PARAMETER ( CZERO = ( 0.0E+0, 0.0E+0 ),
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$ CONE = ( 1.0E+0, 0.0E+0 ) )
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* ..
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* .. Local Scalars ..
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CHARACTER NORMA, NORME
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INTEGER ITRNSE, ITRNSW, J, JCOL, JOFF, JROW, JVEC
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REAL ANORM, ENORM, ENRMAX, ENRMIN, ERRNRM, TEMP1,
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$ ULP, UNFL
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COMPLEX WTEMP
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* ..
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* .. External Functions ..
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LOGICAL LSAME
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REAL CLANGE, SLAMCH
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EXTERNAL LSAME, CLANGE, SLAMCH
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* ..
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* .. External Subroutines ..
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EXTERNAL CGEMM, CLASET
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC ABS, AIMAG, CONJG, MAX, MIN, REAL
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* ..
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* .. Executable Statements ..
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*
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* Initialize RESULT (in case N=0)
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*
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RESULT( 1 ) = ZERO
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RESULT( 2 ) = ZERO
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IF( N.LE.0 )
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$ RETURN
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*
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UNFL = SLAMCH( 'Safe minimum' )
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ULP = SLAMCH( 'Precision' )
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*
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ITRNSE = 0
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ITRNSW = 0
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NORMA = 'O'
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NORME = 'O'
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*
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IF( LSAME( TRANSA, 'T' ) .OR. LSAME( TRANSA, 'C' ) ) THEN
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NORMA = 'I'
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END IF
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*
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IF( LSAME( TRANSE, 'T' ) ) THEN
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ITRNSE = 1
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NORME = 'I'
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ELSE IF( LSAME( TRANSE, 'C' ) ) THEN
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ITRNSE = 2
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NORME = 'I'
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END IF
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*
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IF( LSAME( TRANSW, 'C' ) ) THEN
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ITRNSW = 1
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END IF
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*
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* Normalization of E:
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*
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ENRMIN = ONE / ULP
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ENRMAX = ZERO
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IF( ITRNSE.EQ.0 ) THEN
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DO 20 JVEC = 1, N
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TEMP1 = ZERO
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DO 10 J = 1, N
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TEMP1 = MAX( TEMP1, ABS( REAL( E( J, JVEC ) ) )+
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$ ABS( AIMAG( E( J, JVEC ) ) ) )
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10 CONTINUE
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ENRMIN = MIN( ENRMIN, TEMP1 )
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ENRMAX = MAX( ENRMAX, TEMP1 )
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20 CONTINUE
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ELSE
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DO 30 JVEC = 1, N
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RWORK( JVEC ) = ZERO
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30 CONTINUE
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*
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DO 50 J = 1, N
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DO 40 JVEC = 1, N
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RWORK( JVEC ) = MAX( RWORK( JVEC ),
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$ ABS( REAL( E( JVEC, J ) ) )+
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$ ABS( AIMAG( E( JVEC, J ) ) ) )
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40 CONTINUE
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50 CONTINUE
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*
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DO 60 JVEC = 1, N
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ENRMIN = MIN( ENRMIN, RWORK( JVEC ) )
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ENRMAX = MAX( ENRMAX, RWORK( JVEC ) )
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60 CONTINUE
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END IF
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*
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* Norm of A:
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*
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ANORM = MAX( CLANGE( NORMA, N, N, A, LDA, RWORK ), UNFL )
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*
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* Norm of E:
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*
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ENORM = MAX( CLANGE( NORME, N, N, E, LDE, RWORK ), ULP )
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*
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* Norm of error:
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*
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* Error = AE - EW
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*
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CALL CLASET( 'Full', N, N, CZERO, CZERO, WORK, N )
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*
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JOFF = 0
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DO 100 JCOL = 1, N
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IF( ITRNSW.EQ.0 ) THEN
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WTEMP = W( JCOL )
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ELSE
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WTEMP = CONJG( W( JCOL ) )
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END IF
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*
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IF( ITRNSE.EQ.0 ) THEN
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DO 70 JROW = 1, N
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WORK( JOFF+JROW ) = E( JROW, JCOL )*WTEMP
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70 CONTINUE
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ELSE IF( ITRNSE.EQ.1 ) THEN
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DO 80 JROW = 1, N
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WORK( JOFF+JROW ) = E( JCOL, JROW )*WTEMP
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80 CONTINUE
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ELSE
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DO 90 JROW = 1, N
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WORK( JOFF+JROW ) = CONJG( E( JCOL, JROW ) )*WTEMP
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90 CONTINUE
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END IF
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JOFF = JOFF + N
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100 CONTINUE
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*
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CALL CGEMM( TRANSA, TRANSE, N, N, N, CONE, A, LDA, E, LDE, -CONE,
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$ WORK, N )
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*
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ERRNRM = CLANGE( 'One', N, N, WORK, N, RWORK ) / ENORM
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*
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* Compute RESULT(1) (avoiding under/overflow)
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*
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IF( ANORM.GT.ERRNRM ) THEN
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RESULT( 1 ) = ( ERRNRM / ANORM ) / ULP
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ELSE
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IF( ANORM.LT.ONE ) THEN
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RESULT( 1 ) = ONE / ULP
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ELSE
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RESULT( 1 ) = MIN( ERRNRM / ANORM, ONE ) / ULP
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END IF
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END IF
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*
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* Compute RESULT(2) : the normalization error in E.
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*
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RESULT( 2 ) = MAX( ABS( ENRMAX-ONE ), ABS( ENRMIN-ONE ) ) /
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$ ( REAL( N )*ULP )
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*
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RETURN
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*
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* End of CGET22
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*
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END
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