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312 lines
11 KiB
312 lines
11 KiB
2 years ago
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*> \brief \b SSYL01
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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 SSYL01( THRESH, NFAIL, RMAX, NINFO, KNT )
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*
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* .. Scalar Arguments ..
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* INTEGER KNT
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* REAL THRESH
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* ..
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* .. Array Arguments ..
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* INTEGER NFAIL( 3 ), NINFO( 2 )
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* REAL RMAX( 2 )
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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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*> SSYL01 tests STRSYL and STRSYL3, routines for solving the Sylvester matrix
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*> equation
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*>
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*> op(A)*X + ISGN*X*op(B) = scale*C,
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*>
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*> A and B are assumed to be in Schur canonical form, op() represents an
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*> optional transpose, and ISGN can be -1 or +1. Scale is an output
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*> less than or equal to 1, chosen to avoid overflow in X.
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*>
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*> The test code verifies that the following residual does not exceed
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*> the provided threshold:
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*>
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*> norm(op(A)*X + ISGN*X*op(B) - scale*C) /
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*> (EPS*max(norm(A),norm(B))*norm(X))
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*>
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*> This routine complements SGET35 by testing with larger,
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*> random matrices, of which some require rescaling of X to avoid overflow.
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*>
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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] THRESH
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*> \verbatim
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*> THRESH is REAL
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*> A test will count as "failed" if the residual, computed as
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*> described above, exceeds THRESH.
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*> \endverbatim
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*>
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*> \param[out] NFAIL
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*> \verbatim
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*> NFAIL is INTEGER array, dimension (3)
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*> NFAIL(1) = No. of times residual STRSYL exceeds threshold THRESH
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*> NFAIL(2) = No. of times residual STRSYL3 exceeds threshold THRESH
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*> NFAIL(3) = No. of times STRSYL3 and STRSYL deviate
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*> \endverbatim
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*>
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*> \param[out] RMAX
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*> \verbatim
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*> RMAX is REAL, dimension (2)
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*> RMAX(1) = Value of the largest test ratio of STRSYL
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*> RMAX(2) = Value of the largest test ratio of STRSYL3
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*> \endverbatim
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*>
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*> \param[out] NINFO
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*> \verbatim
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*> NINFO is INTEGER array, dimension (2)
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*> NINFO(1) = No. of times STRSYL returns an expected INFO
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*> NINFO(2) = No. of times STRSYL3 returns an expected INFO
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*> \endverbatim
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*>
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*> \param[out] KNT
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*> \verbatim
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*> KNT is INTEGER
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*> Total number of examples tested.
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*> \endverbatim
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*
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* -- LAPACK test routine --
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SUBROUTINE SSYL01( THRESH, NFAIL, RMAX, NINFO, KNT )
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IMPLICIT NONE
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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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INTEGER KNT
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REAL THRESH
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* ..
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* .. Array Arguments ..
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INTEGER NFAIL( 3 ), NINFO( 2 )
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REAL RMAX( 2 )
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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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INTEGER MAXM, MAXN, LDSWORK
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PARAMETER ( MAXM = 101, MAXN = 138, LDSWORK = 18 )
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* ..
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* .. Local Scalars ..
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CHARACTER TRANA, TRANB
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INTEGER I, INFO, IINFO, ISGN, ITRANA, ITRANB, J, KLA,
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$ KUA, KLB, KUB, LIWORK, M, N
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REAL ANRM, BNRM, BIGNUM, EPS, RES, RES1, RMUL,
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$ SCALE, SCALE3, SMLNUM, TNRM, XNRM
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* ..
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* .. Local Arrays ..
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REAL DUML( MAXM ), DUMR( MAXN ),
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$ D( MAX( MAXM, MAXN ) ), DUM( MAXN ),
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$ VM( 2 )
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INTEGER ISEED( 4 ), IWORK( MAXM + MAXN + 2 )
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* ..
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* .. Allocatable Arrays ..
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INTEGER AllocateStatus
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REAL, DIMENSION(:,:), ALLOCATABLE :: A, B, C, CC, X,
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$ SWORK
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* ..
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* .. External Functions ..
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LOGICAL SISNAN
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REAL SLAMCH, SLANGE
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EXTERNAL SISNAN, SLAMCH, SLANGE
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* ..
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* .. External Subroutines ..
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EXTERNAL SLATMR, SLACPY, SGEMM, STRSYL, STRSYL3
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC ABS, REAL, MAX
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* ..
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* .. Allocate memory dynamically ..
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ALLOCATE ( A( MAXM, MAXM ), STAT = AllocateStatus )
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IF( AllocateStatus /= 0 ) STOP "*** Not enough memory ***"
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ALLOCATE ( B( MAXN, MAXN ), STAT = AllocateStatus )
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IF( AllocateStatus /= 0 ) STOP "*** Not enough memory ***"
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ALLOCATE ( C( MAXM, MAXN ), STAT = AllocateStatus )
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IF( AllocateStatus /= 0 ) STOP "*** Not enough memory ***"
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ALLOCATE ( CC( MAXM, MAXN ), STAT = AllocateStatus )
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IF( AllocateStatus /= 0 ) STOP "*** Not enough memory ***"
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ALLOCATE ( X( MAXM, MAXN ), STAT = AllocateStatus )
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IF( AllocateStatus /= 0 ) STOP "*** Not enough memory ***"
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ALLOCATE ( SWORK( LDSWORK, 54 ), STAT = AllocateStatus )
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IF( AllocateStatus /= 0 ) STOP "*** Not enough memory ***"
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* ..
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* .. Executable Statements ..
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*
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* Get machine parameters
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*
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EPS = SLAMCH( 'P' )
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SMLNUM = SLAMCH( 'S' ) / EPS
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BIGNUM = ONE / SMLNUM
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*
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VM( 1 ) = ONE
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VM( 2 ) = 0.05E+0
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*
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* Begin test loop
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*
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NINFO( 1 ) = 0
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NINFO( 2 ) = 0
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NFAIL( 1 ) = 0
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NFAIL( 2 ) = 0
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NFAIL( 3 ) = 0
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RMAX( 1 ) = ZERO
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RMAX( 2 ) = ZERO
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KNT = 0
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DO I = 1, 4
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ISEED( I ) = 1
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END DO
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SCALE = ONE
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SCALE3 = ONE
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LIWORK = MAXM + MAXN + 2
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DO J = 1, 2
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DO ISGN = -1, 1, 2
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* Reset seed (overwritten by LATMR)
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DO I = 1, 4
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ISEED( I ) = 1
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END DO
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DO M = 32, MAXM, 71
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KLA = 0
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KUA = M - 1
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CALL SLATMR( M, M, 'S', ISEED, 'N', D,
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$ 6, ONE, ONE, 'T', 'N',
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$ DUML, 1, ONE, DUMR, 1, ONE,
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$ 'N', IWORK, KLA, KUA, ZERO,
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$ ONE, 'NO', A, MAXM, IWORK, IINFO )
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DO I = 1, M
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A( I, I ) = A( I, I ) * VM( J )
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END DO
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ANRM = SLANGE( 'M', M, M, A, MAXM, DUM )
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DO N = 51, MAXN, 47
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KLB = 0
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KUB = N - 1
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CALL SLATMR( N, N, 'S', ISEED, 'N', D,
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$ 6, ONE, ONE, 'T', 'N',
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$ DUML, 1, ONE, DUMR, 1, ONE,
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$ 'N', IWORK, KLB, KUB, ZERO,
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$ ONE, 'NO', B, MAXN, IWORK, IINFO )
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BNRM = SLANGE( 'M', N, N, B, MAXN, DUM )
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TNRM = MAX( ANRM, BNRM )
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CALL SLATMR( M, N, 'S', ISEED, 'N', D,
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$ 6, ONE, ONE, 'T', 'N',
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$ DUML, 1, ONE, DUMR, 1, ONE,
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$ 'N', IWORK, M, N, ZERO, ONE,
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$ 'NO', C, MAXM, IWORK, IINFO )
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DO ITRANA = 1, 2
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IF( ITRANA.EQ.1 ) THEN
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TRANA = 'N'
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END IF
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IF( ITRANA.EQ.2 ) THEN
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TRANA = 'T'
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END IF
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DO ITRANB = 1, 2
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IF( ITRANB.EQ.1 ) THEN
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TRANB = 'N'
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END IF
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IF( ITRANB.EQ.2 ) THEN
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TRANB = 'T'
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END IF
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KNT = KNT + 1
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*
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CALL SLACPY( 'All', M, N, C, MAXM, X, MAXM)
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CALL SLACPY( 'All', M, N, C, MAXM, CC, MAXM)
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CALL STRSYL( TRANA, TRANB, ISGN, M, N,
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$ A, MAXM, B, MAXN, X, MAXM,
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$ SCALE, IINFO )
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IF( IINFO.NE.0 )
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$ NINFO( 1 ) = NINFO( 1 ) + 1
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XNRM = SLANGE( 'M', M, N, X, MAXM, DUM )
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RMUL = ONE
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IF( XNRM.GT.ONE .AND. TNRM.GT.ONE ) THEN
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IF( XNRM.GT.BIGNUM / TNRM ) THEN
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RMUL = ONE / MAX( XNRM, TNRM )
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END IF
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END IF
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CALL SGEMM( TRANA, 'N', M, N, M, RMUL,
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$ A, MAXM, X, MAXM, -SCALE*RMUL,
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$ C, MAXM )
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CALL SGEMM( 'N', TRANB, M, N, N,
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$ REAL( ISGN )*RMUL, X, MAXM, B,
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$ MAXN, ONE, C, MAXM )
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RES1 = SLANGE( 'M', M, N, C, MAXM, DUM )
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RES = RES1 / MAX( SMLNUM, SMLNUM*XNRM,
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$ ( ( RMUL*TNRM )*EPS )*XNRM )
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IF( RES.GT.THRESH )
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$ NFAIL( 1 ) = NFAIL( 1 ) + 1
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IF( RES.GT.RMAX( 1 ) )
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$ RMAX( 1 ) = RES
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*
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CALL SLACPY( 'All', M, N, C, MAXM, X, MAXM )
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CALL SLACPY( 'All', M, N, C, MAXM, CC, MAXM )
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CALL STRSYL3( TRANA, TRANB, ISGN, M, N,
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$ A, MAXM, B, MAXN, X, MAXM,
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$ SCALE3, IWORK, LIWORK,
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$ SWORK, LDSWORK, INFO)
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IF( INFO.NE.0 )
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$ NINFO( 2 ) = NINFO( 2 ) + 1
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XNRM = SLANGE( 'M', M, N, X, MAXM, DUM )
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RMUL = ONE
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IF( XNRM.GT.ONE .AND. TNRM.GT.ONE ) THEN
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IF( XNRM.GT.BIGNUM / TNRM ) THEN
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RMUL = ONE / MAX( XNRM, TNRM )
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END IF
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END IF
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CALL SGEMM( TRANA, 'N', M, N, M, RMUL,
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$ A, MAXM, X, MAXM, -SCALE3*RMUL,
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$ CC, MAXM )
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CALL SGEMM( 'N', TRANB, M, N, N,
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$ REAL( ISGN )*RMUL, X, MAXM, B,
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$ MAXN, ONE, CC, MAXM )
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RES1 = SLANGE( 'M', M, N, CC, MAXM, DUM )
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RES = RES1 / MAX( SMLNUM, SMLNUM*XNRM,
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$ ( ( RMUL*TNRM )*EPS )*XNRM )
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* Verify that TRSYL3 only flushes if TRSYL flushes (but
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* there may be cases where TRSYL3 avoid flushing).
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IF( SCALE3.EQ.ZERO .AND. SCALE.GT.ZERO .OR.
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$ IINFO.NE.INFO ) THEN
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NFAIL( 3 ) = NFAIL( 3 ) + 1
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END IF
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IF( RES.GT.THRESH .OR. SISNAN( RES ) )
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$ NFAIL( 2 ) = NFAIL( 2 ) + 1
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IF( RES.GT.RMAX( 2 ) )
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$ RMAX( 2 ) = RES
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END DO
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END DO
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END DO
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END DO
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END DO
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END DO
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*
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DEALLOCATE (A, STAT = AllocateStatus)
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DEALLOCATE (B, STAT = AllocateStatus)
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DEALLOCATE (C, STAT = AllocateStatus)
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DEALLOCATE (CC, STAT = AllocateStatus)
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DEALLOCATE (X, STAT = AllocateStatus)
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DEALLOCATE (SWORK, STAT = AllocateStatus)
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*
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RETURN
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*
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* End of SSYL01
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*
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END
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