zdrvgt.f

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*> \brief \b ZDRVGT
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at
*            http://www.netlib.org/lapack/explore-html/
*
*  Definition:
*  ===========
*
*       SUBROUTINE ZDRVGT( DOTYPE, NN, NVAL, NRHS, THRESH, TSTERR, A, AF,
*                          B, X, XACT, WORK, RWORK, IWORK, NOUT )
*
*       .. Scalar Arguments ..
*       LOGICAL            TSTERR
*       INTEGER            NN, NOUT, NRHS
*       DOUBLE PRECISION   THRESH
*       ..
*       .. Array Arguments ..
*       LOGICAL            DOTYPE( * )
*       INTEGER            IWORK( * ), NVAL( * )
*       DOUBLE PRECISION   RWORK( * )
*       COMPLEX*16         A( * ), AF( * ), B( * ), WORK( * ), X( * ),
*      $                   XACT( * )
*       ..
*
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> ZDRVGT tests ZGTSV and -SVX.
*> \endverbatim
*
*  Arguments:
*  ==========
*
*> \param[in] DOTYPE
*> \verbatim
*>          DOTYPE is LOGICAL array, dimension (NTYPES)
*>          The matrix types to be used for testing.  Matrices of type j
*>          (for 1 <= j <= NTYPES) are used for testing if DOTYPE(j) =
*>          .TRUE.; if DOTYPE(j) = .FALSE., then type j is not used.
*> \endverbatim
*>
*> \param[in] NN
*> \verbatim
*>          NN is INTEGER
*>          The number of values of N contained in the vector NVAL.
*> \endverbatim
*>
*> \param[in] NVAL
*> \verbatim
*>          NVAL is INTEGER array, dimension (NN)
*>          The values of the matrix dimension N.
*> \endverbatim
*>
*> \param[in] NRHS
*> \verbatim
*>          NRHS is INTEGER
*>          The number of right hand sides, NRHS >= 0.
*> \endverbatim
*>
*> \param[in] THRESH
*> \verbatim
*>          THRESH is DOUBLE PRECISION
*>          The threshold value for the test ratios.  A result is
*>          included in the output file if RESULT >= THRESH.  To have
*>          every test ratio printed, use THRESH = 0.
*> \endverbatim
*>
*> \param[in] TSTERR
*> \verbatim
*>          TSTERR is LOGICAL
*>          Flag that indicates whether error exits are to be tested.
*> \endverbatim
*>
*> \param[out] A
*> \verbatim
*>          A is COMPLEX*16 array, dimension (NMAX*4)
*> \endverbatim
*>
*> \param[out] AF
*> \verbatim
*>          AF is COMPLEX*16 array, dimension (NMAX*4)
*> \endverbatim
*>
*> \param[out] B
*> \verbatim
*>          B is COMPLEX*16 array, dimension (NMAX*NRHS)
*> \endverbatim
*>
*> \param[out] X
*> \verbatim
*>          X is COMPLEX*16 array, dimension (NMAX*NRHS)
*> \endverbatim
*>
*> \param[out] XACT
*> \verbatim
*>          XACT is COMPLEX*16 array, dimension (NMAX*NRHS)
*> \endverbatim
*>
*> \param[out] WORK
*> \verbatim
*>          WORK is COMPLEX*16 array, dimension
*>                      (NMAX*max(3,NRHS))
*> \endverbatim
*>
*> \param[out] RWORK
*> \verbatim
*>          RWORK is DOUBLE PRECISION array, dimension (NMAX+2*NRHS)
*> \endverbatim
*>
*> \param[out] IWORK
*> \verbatim
*>          IWORK is INTEGER array, dimension (2*NMAX)
*> \endverbatim
*>
*> \param[in] NOUT
*> \verbatim
*>          NOUT is INTEGER
*>          The unit number for output.
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee
*> \author Univ. of California Berkeley
*> \author Univ. of Colorado Denver
*> \author NAG Ltd.
*
*> \ingroup complex16_lin
*
*  =====================================================================
      SUBROUTINE zdrvgt( DOTYPE, NN, NVAL, NRHS, THRESH, TSTERR, A, AF,
     $                   B, X, XACT, WORK, RWORK, IWORK, NOUT )
*
*  -- LAPACK test routine --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*     .. Scalar Arguments ..
      LOGICAL            TSTERR
      INTEGER            NN, NOUT, NRHS
      DOUBLE PRECISION   THRESH
*     ..
*     .. Array Arguments ..
      LOGICAL            DOTYPE( * )
      INTEGER            IWORK( * ), NVAL( * )
      DOUBLE PRECISION   RWORK( * )
      COMPLEX*16         A( * ), AF( * ), B( * ), WORK( * ), X( * ),
     $                   xact( * )
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      DOUBLE PRECISION   ONE, ZERO
      parameter( one = 1.0d+0, zero = 0.0d+0 )
      INTEGER            NTYPES
      parameter( ntypes = 12 )
      INTEGER            NTESTS
      parameter( ntests = 6 )
*     ..
*     .. Local Scalars ..
      LOGICAL            TRFCON, ZEROT
      CHARACTER          DIST, FACT, TRANS, TYPE
      CHARACTER*3        PATH
      INTEGER            I, IFACT, IMAT, IN, INFO, ITRAN, IX, IZERO, J,
     $                   k, k1, kl, koff, ku, lda, m, mode, n, nerrs,
     $                   nfail, nimat, nrun, nt
      DOUBLE PRECISION   AINVNM, ANORM, ANORMI, ANORMO, COND, RCOND,
     $                   rcondc, rcondi, rcondo
*     ..
*     .. Local Arrays ..
      CHARACTER          TRANSS( 3 )
      INTEGER            ISEED( 4 ), ISEEDY( 4 )
      DOUBLE PRECISION   RESULT( NTESTS ), Z( 3 )
*     ..
*     .. External Functions ..
      DOUBLE PRECISION   DGET06, DZASUM, ZLANGT
      EXTERNAL           dget06, dzasum, zlangt
*     ..
*     .. External Subroutines ..
      EXTERNAL           aladhd, alaerh, alasvm, zcopy, zdscal, zerrvx,
     $                   zget04, zgtsv, zgtsvx, zgtt01, zgtt02, zgtt05,
     $                   zgttrf, zgttrs, zlacpy, zlagtm, zlarnv, zlaset,
     $                   zlatb4, zlatms
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          dcmplx, max
*     ..
*     .. Scalars in Common ..
      LOGICAL            LERR, OK
      CHARACTER*32       SRNAMT
      INTEGER            INFOT, NUNIT
*     ..
*     .. Common blocks ..
      COMMON             / infoc / infot, nunit, ok, lerr
      COMMON             / srnamc / srnamt
*     ..
*     .. Data statements ..
      DATA               iseedy / 0, 0, 0, 1 / , transs / 'N', 'T',
     $                   'C' /
*     ..
*     .. Executable Statements ..
*
      path( 1: 1 ) = 'Zomplex precision'
      path( 2: 3 ) = 'GT'
      nrun = 0
      nfail = 0
      nerrs = 0
      DO 10 i = 1, 4
         iseed( i ) = iseedy( i )
   10 CONTINUE
*
*     Test the error exits
*
      IF( tsterr )
     $   CALL zerrvx( path, nout )
      infot = 0
*
      DO 140 in = 1, nn
*
*        Do for each value of N in NVAL.
*
         n = nval( in )
         m = max( n-1, 0 )
         lda = max( 1, n )
         nimat = ntypes
         IF( n.LE.0 )
     $      nimat = 1
*
         DO 130 imat = 1, nimat
*
*           Do the tests only if DOTYPE( IMAT ) is true.
*
            IF( .NOT.dotype( imat ) )
     $         GO TO 130
*
*           Set up parameters with ZLATB4.
*
            CALL zlatb4( path, imat, n, n, TYPE, kl, ku, anorm, mode,
     $                   cond, dist )
*
            zerot = imat.GE.8 .AND. imat.LE.10
            IF( imat.LE.6 ) THEN
*
*              Types 1-6:  generate matrices of known condition number.
*
               koff = max( 2-ku, 3-max( 1, n ) )
               srnamt = 'ZLATMS'
               CALL zlatms( n, n, dist, iseed, TYPE, rwork, mode, cond,
     $                      anorm, kl, ku, 'Z', af( koff ), 3, work,
     $                      info )
*
*              Check the error code from ZLATMS.
*
               IF( info.NE.0 ) THEN
                  CALL alaerh( path, 'ZLATMS', info, 0, ' ', n, n, kl,
     $                         ku, -1, imat, nfail, nerrs, nout )
                  GO TO 130
               END IF
               izero = 0
*
               IF( n.GT.1 ) THEN
                  CALL zcopy( n-1, af( 4 ), 3, a, 1 )
                  CALL zcopy( n-1, af( 3 ), 3, a( n+m+1 ), 1 )
               END IF
               CALL zcopy( n, af( 2 ), 3, a( m+1 ), 1 )
            ELSE
*
*              Types 7-12:  generate tridiagonal matrices with
*              unknown condition numbers.
*
               IF( .NOT.zerot .OR. .NOT.dotype( 7 ) ) THEN
*
*                 Generate a matrix with elements from [-1,1].
*
                  CALL zlarnv( 2, iseed, n+2*m, a )
                  IF( anorm.NE.one )
     $               CALL zdscal( n+2*m, anorm, a, 1 )
               ELSE IF( izero.GT.0 ) THEN
*
*                 Reuse the last matrix by copying back the zeroed out
*                 elements.
*
                  IF( izero.EQ.1 ) THEN
                     a( n ) = z( 2 )
                     IF( n.GT.1 )
     $                  a( 1 ) = z( 3 )
                  ELSE IF( izero.EQ.n ) THEN
                     a( 3*n-2 ) = z( 1 )
                     a( 2*n-1 ) = z( 2 )
                  ELSE
                     a( 2*n-2+izero ) = z( 1 )
                     a( n-1+izero ) = z( 2 )
                     a( izero ) = z( 3 )
                  END IF
               END IF
*
*              If IMAT > 7, set one column of the matrix to 0.
*
               IF( .NOT.zerot ) THEN
                  izero = 0
               ELSE IF( imat.EQ.8 ) THEN
                  izero = 1
                  z( 2 ) = a( n )
                  a( n ) = zero
                  IF( n.GT.1 ) THEN
                     z( 3 ) = a( 1 )
                     a( 1 ) = zero
                  END IF
               ELSE IF( imat.EQ.9 ) THEN
                  izero = n
                  z( 1 ) = a( 3*n-2 )
                  z( 2 ) = a( 2*n-1 )
                  a( 3*n-2 ) = zero
                  a( 2*n-1 ) = zero
               ELSE
                  izero = ( n+1 ) / 2
                  DO 20 i = izero, n - 1
                     a( 2*n-2+i ) = zero
                     a( n-1+i ) = zero
                     a( i ) = zero
   20             CONTINUE
                  a( 3*n-2 ) = zero
                  a( 2*n-1 ) = zero
               END IF
            END IF
*
            DO 120 ifact = 1, 2
               IF( ifact.EQ.1 ) THEN
                  fact = 'F'
               ELSE
                  fact = 'N'
               END IF
*
*              Compute the condition number for comparison with
*              the value returned by ZGTSVX.
*
               IF( zerot ) THEN
                  IF( ifact.EQ.1 )
     $               GO TO 120
                  rcondo = zero
                  rcondi = zero
*
               ELSE IF( ifact.EQ.1 ) THEN
                  CALL zcopy( n+2*m, a, 1, af, 1 )
*
*                 Compute the 1-norm and infinity-norm of A.
*
                  anormo = zlangt( '1', n, a, a( m+1 ), a( n+m+1 ) )
                  anormi = zlangt( 'i', N, A, A( M+1 ), A( N+M+1 ) )
*
*                 Factor the matrix A.
*
                  CALL ZGTTRF( N, AF, AF( M+1 ), AF( N+M+1 ),
     $                         AF( N+2*M+1 ), IWORK, INFO )
*
*                 Use ZGTTRS to solve for one column at a time of
*                 inv(A), computing the maximum column sum as we go.
*
                  AINVNM = ZERO
                  DO 40 I = 1, N
                     DO 30 J = 1, N
                        X( J ) = ZERO
   30                CONTINUE
                     X( I ) = ONE
                     CALL ZGTTRS( 'no transpose', N, 1, AF, AF( M+1 ),
     $                            AF( N+M+1 ), AF( N+2*M+1 ), IWORK, X,
     $                            LDA, INFO )
                     AINVNM = MAX( AINVNM, DZASUM( N, X, 1 ) )
   40             CONTINUE
*
*                 Compute the 1-norm condition number of A.
*
.LE..OR..LE.                  IF( ANORMOZERO  AINVNMZERO ) THEN
                     RCONDO = ONE
                  ELSE
                     RCONDO = ( ONE / ANORMO ) / AINVNM
                  END IF
*
*                 Use ZGTTRS to solve for one column at a time of
*                 inv(A'), computing the maximum column sum as we go.
*
                  AINVNM = ZERO
                  DO 60 I = 1, N
                     DO 50 J = 1, N
                        X( J ) = ZERO
   50                CONTINUE
                     X( I ) = ONE
                     CALL ZGTTRS( 'conjugate transpose', N, 1, AF,
     $                            AF( M+1 ), AF( N+M+1 ), AF( N+2*M+1 ),
     $                            IWORK, X, LDA, INFO )
                     AINVNM = MAX( AINVNM, DZASUM( N, X, 1 ) )
   60             CONTINUE
*
*                 Compute the infinity-norm condition number of A.
*
.LE..OR..LE.                  IF( ANORMIZERO  AINVNMZERO ) THEN
                     RCONDI = ONE
                  ELSE
                     RCONDI = ( ONE / ANORMI ) / AINVNM
                  END IF
               END IF
*
               DO 110 ITRAN = 1, 3
                  TRANS = TRANSS( ITRAN )
.EQ.                  IF( ITRAN1 ) THEN
                     RCONDC = RCONDO
                  ELSE
                     RCONDC = RCONDI
                  END IF
*
*                 Generate NRHS random solution vectors.
*
                  IX = 1
                  DO 70 J = 1, NRHS
                     CALL ZLARNV( 2, ISEED, N, XACT( IX ) )
                     IX = IX + LDA
   70             CONTINUE
*
*                 Set the right hand side.
*
                  CALL ZLAGTM( TRANS, N, NRHS, ONE, A, A( M+1 ),
     $                         A( N+M+1 ), XACT, LDA, ZERO, B, LDA )
*
.EQ..AND..EQ.                  IF( IFACT2  ITRAN1 ) THEN
*
*                    --- Test ZGTSV  ---
*
*                    Solve the system using Gaussian elimination with
*                    partial pivoting.
*
                     CALL ZCOPY( N+2*M, A, 1, AF, 1 )
                     CALL ZLACPY( 'full', N, NRHS, B, LDA, X, LDA )
*
                     SRNAMT = 'zgtsv '
                     CALL ZGTSV( N, NRHS, AF, AF( M+1 ), AF( N+M+1 ), X,
     $                           LDA, INFO )
*
*                    Check error code from ZGTSV .
*
.NE.                     IF( INFOIZERO )
     $                  CALL ALAERH( PATH, 'zgtsv ', INFO, IZERO, ' ',
     $                               N, N, 1, 1, NRHS, IMAT, NFAIL,
     $                               NERRS, NOUT )
                     NT = 1
.EQ.                     IF( IZERO0 ) THEN
*
*                       Check residual of computed solution.
*
                        CALL ZLACPY( 'full', N, NRHS, B, LDA, WORK,
     $                               LDA )
                        CALL ZGTT02( TRANS, N, NRHS, A, A( M+1 ),
     $                               A( N+M+1 ), X, LDA, WORK, LDA,
     $                               RESULT( 2 ) )
*
*                       Check solution from generated exact solution.
*
                        CALL ZGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                               RESULT( 3 ) )
                        NT = 3
                     END IF
*
*                    Print information about the tests that did not pass
*                    the threshold.
*
                     DO 80 K = 2, NT
.GE.                        IF( RESULT( K )THRESH ) THEN
.EQ..AND..EQ.                           IF( NFAIL0  NERRS0 )
     $                        CALL ALADHD( NOUT, PATH )
                           WRITE( NOUT, FMT = 9999 )'zgtsv ', N, IMAT,
     $                        K, RESULT( K )
                           NFAIL = NFAIL + 1
                        END IF
   80                CONTINUE
                     NRUN = NRUN + NT - 1
                  END IF
*
*                 --- Test ZGTSVX ---
*
.GT.                  IF( IFACT1 ) THEN
*
*                    Initialize AF to zero.
*
                     DO 90 I = 1, 3*N - 2
                        AF( I ) = ZERO
   90                CONTINUE
                  END IF
                  CALL ZLASET( 'full', N, NRHS, DCMPLX( ZERO ),
     $                         DCMPLX( ZERO ), X, LDA )
*
*                 Solve the system and compute the condition number and
*                 error bounds using ZGTSVX.
*
                  SRNAMT = 'zgtsvx'
                  CALL ZGTSVX( FACT, TRANS, N, NRHS, A, A( M+1 ),
     $                         A( N+M+1 ), AF, AF( M+1 ), AF( N+M+1 ),
     $                         AF( N+2*M+1 ), IWORK, B, LDA, X, LDA,
     $                         RCOND, RWORK, RWORK( NRHS+1 ), WORK,
     $                         RWORK( 2*NRHS+1 ), INFO )
*
*                 Check the error code from ZGTSVX.
*
.NE.                  IF( INFOIZERO )
     $               CALL ALAERH( PATH, 'zgtsvx', INFO, IZERO,
     $                            FACT // TRANS, N, N, 1, 1, NRHS, IMAT,
     $                            NFAIL, NERRS, NOUT )
*
.GE.                  IF( IFACT2 ) THEN
*
*                    Reconstruct matrix from factors and compute
*                    residual.
*
                     CALL ZGTT01( N, A, A( M+1 ), A( N+M+1 ), AF,
     $                            AF( M+1 ), AF( N+M+1 ), AF( N+2*M+1 ),
     $                            IWORK, WORK, LDA, RWORK, RESULT( 1 ) )
                     K1 = 1
                  ELSE
                     K1 = 2
                  END IF
*
.EQ.                  IF( INFO0 ) THEN
                     TRFCON = .FALSE.
*
*                    Check residual of computed solution.
*
                     CALL ZLACPY( 'full', N, NRHS, B, LDA, WORK, LDA )
                     CALL ZGTT02( TRANS, N, NRHS, A, A( M+1 ),
     $                            A( N+M+1 ), X, LDA, WORK, LDA,
     $                            RESULT( 2 ) )
*
*                    Check solution from generated exact solution.
*
                     CALL ZGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                            RESULT( 3 ) )
*
*                    Check the error bounds from iterative refinement.
*
                     CALL ZGTT05( TRANS, N, NRHS, A, A( M+1 ),
     $                            A( N+M+1 ), B, LDA, X, LDA, XACT, LDA,
     $                            RWORK, RWORK( NRHS+1 ), RESULT( 4 ) )
                     NT = 5
                  END IF
*
*                 Print information about the tests that did not pass
*                 the threshold.
*
                  DO 100 K = K1, NT
.GE.                     IF( RESULT( K )THRESH ) THEN
.EQ..AND..EQ.                        IF( NFAIL0  NERRS0 )
     $                     CALL ALADHD( NOUT, PATH )
                        WRITE( NOUT, FMT = 9998 )'zgtsvx', FACT, TRANS,
     $                     N, IMAT, K, RESULT( K )
                        NFAIL = NFAIL + 1
                     END IF
  100             CONTINUE
*
*                 Check the reciprocal of the condition number.
*
                  RESULT( 6 ) = DGET06( RCOND, RCONDC )
.GE.                  IF( RESULT( 6 )THRESH ) THEN
.EQ..AND..EQ.                     IF( NFAIL0  NERRS0 )
     $                  CALL ALADHD( NOUT, PATH )
                     WRITE( NOUT, FMT = 9998 )'zgtsvx', FACT, TRANS, N,
     $                  IMAT, K, RESULT( K )
                     NFAIL = NFAIL + 1
                  END IF
                  NRUN = NRUN + NT - K1 + 2
*
  110          CONTINUE
  120       CONTINUE
  130    CONTINUE
  140 CONTINUE
*
*     Print a summary of the results.
*
      CALL ALASVM( PATH, NOUT, NFAIL, NRUN, NERRS )
*
 9999 FORMAT( 1X, A, ', n =', I5, ', type ', I2, ', test ', I2,
     $      ', ratio = ', G12.5 )
 9998 FORMAT( 1X, A, ', fact=''', A1, ''', trans=''', A1, ''', n =',
     $      I5, ', type ', I2, ', test ', I2, ', ratio = ', G12.5 )
      RETURN
*
*     End of ZDRVGT
*
      END