zchksy.f

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*> \brief \b ZCHKSY
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at
*            http://www.netlib.org/lapack/explore-html/
*
*  Definition:
*  ===========
*
*       SUBROUTINE ZCHKSY( DOTYPE, NN, NVAL, NNB, NBVAL, NNS, NSVAL,
*                          THRESH, TSTERR, NMAX, A, AFAC, AINV, B, X,
*                          XACT, WORK, RWORK, IWORK, NOUT )
*
*       .. Scalar Arguments ..
*       LOGICAL            TSTERR
*       INTEGER            NMAX, NN, NNB, NNS, NOUT
*       DOUBLE PRECISION   THRESH
*       ..
*       .. Array Arguments ..
*       LOGICAL            DOTYPE( * )
*       INTEGER            IWORK( * ), NBVAL( * ), NSVAL( * ), NVAL( * )
*       DOUBLE PRECISION   RWORK( * )
*       COMPLEX*16         A( * ), AFAC( * ), AINV( * ), B( * ),
*      $                   WORK( * ), X( * ), XACT( * )
*       ..
*
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> ZCHKSY tests ZSYTRF, -TRI2, -TRS, -TRS2,  -RFS, and -CON.
*> \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] NNB
*> \verbatim
*>          NNB is INTEGER
*>          The number of values of NB contained in the vector NBVAL.
*> \endverbatim
*>
*> \param[in] NBVAL
*> \verbatim
*>          NBVAL is INTEGER array, dimension (NNB)
*>          The values of the blocksize NB.
*> \endverbatim
*>
*> \param[in] NNS
*> \verbatim
*>          NNS is INTEGER
*>          The number of values of NRHS contained in the vector NSVAL.
*> \endverbatim
*>
*> \param[in] NSVAL
*> \verbatim
*>          NSVAL is INTEGER array, dimension (NNS)
*>          The values of the number of right hand sides NRHS.
*> \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[in] NMAX
*> \verbatim
*>          NMAX is INTEGER
*>          The maximum value permitted for N, used in dimensioning the
*>          work arrays.
*> \endverbatim
*>
*> \param[out] A
*> \verbatim
*>          A is COMPLEX*16 array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] AFAC
*> \verbatim
*>          AFAC is COMPLEX*16 array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] AINV
*> \verbatim
*>          AINV is COMPLEX*16 array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] B
*> \verbatim
*>          B is COMPLEX*16 array, dimension (NMAX*NSMAX)
*>          where NSMAX is the largest entry in NSVAL.
*> \endverbatim
*>
*> \param[out] X
*> \verbatim
*>          X is COMPLEX*16 array, dimension (NMAX*NSMAX)
*> \endverbatim
*>
*> \param[out] XACT
*> \verbatim
*>          XACT is COMPLEX*16 array, dimension (NMAX*NSMAX)
*> \endverbatim
*>
*> \param[out] WORK
*> \verbatim
*>          WORK is COMPLEX*16 array, dimension (NMAX*max(2,NSMAX))
*> \endverbatim
*>
*> \param[out] RWORK
*> \verbatim
*>          RWORK is DOUBLE PRECISION array, dimension (NMAX+2*NSMAX)
*> \endverbatim
*>
*> \param[out] IWORK
*> \verbatim
*>          IWORK is INTEGER array, dimension (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 zchksy( DOTYPE, NN, NVAL, NNB, NBVAL, NNS, NSVAL,
     $                   THRESH, TSTERR, NMAX, A, AFAC, AINV, 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            NMAX, NN, NNB, NNS, NOUT
      DOUBLE PRECISION   THRESH
*     ..
*     .. Array Arguments ..
      LOGICAL            DOTYPE( * )
      INTEGER            IWORK( * ), NBVAL( * ), NSVAL( * ), NVAL( * )
      DOUBLE PRECISION   RWORK( * )
      COMPLEX*16         A( * ), AFAC( * ), AINV( * ), B( * ),
     $                   work( * ), x( * ), xact( * )
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      DOUBLE PRECISION   ZERO
      PARAMETER          ( ZERO = 0.0d+0 )
      COMPLEX*16         CZERO
      parameter( czero = ( 0.0d+0, 0.0d+0 ) )
      INTEGER            NTYPES
      parameter( ntypes = 11 )
      INTEGER            NTESTS
      parameter( ntests = 9 )
*     ..
*     .. Local Scalars ..
      LOGICAL            TRFCON, ZEROT
      CHARACTER          DIST, TYPE, UPLO, XTYPE
      CHARACTER*3        PATH
      INTEGER            I, I1, I2, IMAT, IN, INB, INFO, IOFF, IRHS,
     $                   iuplo, izero, j, k, kl, ku, lda, lwork, mode,
     $                   n, nb, nerrs, nfail, nimat, nrhs, nrun, nt
      DOUBLE PRECISION   ANORM, CNDNUM, RCOND, RCONDC
*     ..
*     .. Local Arrays ..
      CHARACTER          UPLOS( 2 )
      INTEGER            ISEED( 4 ), ISEEDY( 4 )
      DOUBLE PRECISION   RESULT( NTESTS )
*     ..
*     .. External Functions ..
      DOUBLE PRECISION   DGET06, ZLANSY
      EXTERNAL           DGET06, ZLANSY
*     ..
*     .. External Subroutines ..
      EXTERNAL           alaerh, alahd, alasum, xlaenv, zerrsy, zget04,
     $                   zlacpy, zlarhs, zlatb4, zlatms, zlatsy, zpot05,
     $                   zsycon, zsyrfs, zsyt01, zsyt02, zsyt03, zsytrf,
     $                   zsytri2, zsytrs, zsytrs2
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          max, min
*     ..
*     .. 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 / 1988, 1989, 1990, 1991 /
      DATA               uplos / 'U', 'L' /
*     ..
*     .. Executable Statements ..
*
*     Initialize constants and the random number seed.
*
      path( 1: 1 ) = 'Zomplex precision'
      path( 2: 3 ) = 'SY'
      nrun = 0
      nfail = 0
      nerrs = 0
      DO 10 i = 1, 4
         iseed( i ) = iseedy( i )
   10 CONTINUE
*
*     Test the error exits
*
      IF( tsterr )
     $   CALL zerrsy( path, nout )
      infot = 0
*
*     Set the minimum block size for which the block routine should
*     be used, which will be later returned by ILAENV
*
      CALL xlaenv( 2, 2 )
*
*     Do for each value of N in NVAL
*
      DO 180 in = 1, nn
         n = nval( in )
         lda = max( n, 1 )
         xtype = 'N'
         nimat = ntypes
         IF( n.LE.0 )
     $      nimat = 1
*
         izero = 0
*
*        Do for each value of matrix type IMAT
*
         DO 170 imat = 1, nimat
*
*           Do the tests only if DOTYPE( IMAT ) is true.
*
            IF( .NOT.dotype( imat ) )
     $         GO TO 170
*
*           Skip types 3, 4, 5, or 6 if the matrix size is too small.
*
            zerot = imat.GE.3 .AND. imat.LE.6
            IF( zerot .AND. n.LT.imat-2 )
     $         GO TO 170
*
*           Do first for UPLO = 'U', then for UPLO = 'L'
*
            DO 160 iuplo = 1, 2
               uplo = uplos( iuplo )
*
*              Begin generate test matrix A.
*
               IF( imat.NE.ntypes ) THEN
*
*                 Set up parameters with ZLATB4 for the matrix generator
*                 based on the type of matrix to be generated.
*
                  CALL zlatb4( path, imat, n, n, TYPE, kl, ku, anorm,
     $                         mode, cndnum, dist )
*
*                 Generate a matrix with ZLATMS.
*
                  srnamt = 'ZLATMS'
                  CALL zlatms( n, n, dist, iseed, TYPE, rwork, mode,
     $                         cndnum, anorm, kl, ku, 'N', a, lda, work,
     $                         info )
*
*                 Check error code from ZLATMS and handle error.
*
                  IF( info.NE.0 ) THEN
                     CALL alaerh( path, 'ZLATMS', info, 0, uplo, n, n,
     $                            -1, -1, -1, imat, nfail, nerrs, nout )
*
*                    Skip all tests for this generated matrix
*
                     GO TO 160
                  END IF
*
*                 For matrix types 3-6, zero one or more rows and
*                 columns of the matrix to test that INFO is returned
*                 correctly.
*
                  IF( zerot ) THEN
                     IF( imat.EQ.3 ) THEN
                        izero = 1
                     ELSE IF( imat.EQ.4 ) THEN
                        izero = n
                     ELSE
                        izero = n / 2 + 1
                     END IF
*
                     IF( imat.LT.6 ) THEN
*
*                       Set row and column IZERO to zero.
*
                        IF( iuplo.EQ.1 ) THEN
                           ioff = ( izero-1 )*lda
                           DO 20 i = 1, izero - 1
                              a( ioff+i ) = czero
   20                      CONTINUE
                           ioff = ioff + izero
                           DO 30 i = izero, n
                              a( ioff ) = czero
                              ioff = ioff + lda
   30                      CONTINUE
                        ELSE
                           ioff = izero
                           DO 40 i = 1, izero - 1
                              a( ioff ) = czero
                              ioff = ioff + lda
   40                      CONTINUE
                           ioff = ioff - izero
                           DO 50 i = izero, n
                              a( ioff+i ) = czero
   50                      CONTINUE
                        END IF
                     ELSE
                        IF( iuplo.EQ.1 ) THEN
*
*                          Set the first IZERO rows to zero.
*
                           ioff = 0
                           DO 70 j = 1, n
                              i2 = min( j, izero )
                              DO 60 i = 1, i2
                                 a( ioff+i ) = czero
   60                         CONTINUE
                              ioff = ioff + lda
   70                      CONTINUE
                        ELSE
*
*                          Set the last IZERO rows to zero.
*
                           ioff = 0
                           DO 90 j = 1, n
                              i1 = max( j, izero )
                              DO 80 i = i1, n
                                 a( ioff+i ) = czero
   80                         CONTINUE
                              ioff = ioff + lda
   90                      CONTINUE
                        END IF
                     END IF
                  ELSE
                     izero = 0
                  END IF
*
               ELSE
*
*                 For matrix kind IMAT = 11, generate special block
*                 diagonal matrix to test alternate code
*                 for the 2 x 2 blocks.
*
                  CALL zlatsy( uplo, n, a, lda, iseed )
*
               END IF
*
*              End generate test matrix A.
*
*
*              Do for each value of NB in NBVAL
*
               DO 150 inb = 1, nnb
*
*                 Set the optimal blocksize, which will be later
*                 returned by ILAENV.
*
                  nb = nbval( inb )
                  CALL xlaenv( 1, nb )
*
*                 Copy the test matrix A into matrix AFAC which
*                 will be factorized in place. This is needed to
*                 preserve the test matrix A for subsequent tests.
*
                  CALL zlacpy( uplo, n, n, a, lda, afac, lda )
*
*                 Compute the L*D*L**T or U*D*U**T factorization of the
*                 matrix. IWORK stores details of the interchanges and
*                 the block structure of D. AINV is a work array for
*                 block factorization, LWORK is the length of AINV.
*
                  lwork = max( 2, nb )*lda
                  srnamt = 'ZSYTRF'
                  CALL zsytrf( uplo, n, afac, lda, iwork, ainv, lwork,
     $                         info )
*
*                 Adjust the expected value of INFO to account for
*                 pivoting.
*
                  k = izero
                  IF( k.GT.0 ) THEN
  100                CONTINUE
                     IF( iwork( k ).LT.0 ) THEN
                        IF( iwork( k ).NE.-k ) THEN
                           k = -iwork( k )
                           GO TO 100
                        END IF
                     ELSE IF( iwork( k ).NE.k ) THEN
                        k = iwork( k )
                        GO TO 100
                     END IF
                  END IF
*
*                 Check error code from ZSYTRF and handle error.
*
                  IF( info.NE.k )
     $               CALL alaerh( path, 'ZSYTRF', info, k, uplo, n, n,
     $                            -1, -1, nb, imat, nfail, nerrs, nout )
*
*                 Set the condition estimate flag if the INFO is not 0.
*
                  IF( info.NE.0 ) THEN
                     trfcon = .true.
                  ELSE
                     trfcon = .false.
                  END IF
*
*+    TEST 1
*                 Reconstruct matrix from factors and compute residual.
*
                  CALL zsyt01( uplo, n, a, lda, afac, lda, iwork, ainv,
     $                         lda, rwork, result( 1 ) )
                  nt = 1
*
*+    TEST 2
*                 Form the inverse and compute the residual,
*                 if the factorization was competed without INFO > 0
*                 (i.e. there is no zero rows and columns).
*                 Do it only for the first block size.
*
                  IF( inb.EQ.1 .AND. .NOT.trfcon ) THEN
                     CALL zlacpy( uplo, n, n, afac, lda, ainv, lda )
                     srnamt = 'ZSYTRI2'
                     lwork = (n+nb+1)*(nb+3)
                     CALL zsytri2( uplo, n, ainv, lda, iwork, work,
     $                            lwork, info )
*
*                    Check error code from ZSYTRI2 and handle error.
*
                     IF( info.NE.0 )
     $                  CALL alaerh( path, 'ZSYTRI2', info, 0, uplo, n,
     $                               n, -1, -1, -1, imat, nfail, nerrs,
     $                               nout )
*
*                    Compute the residual for a symmetric matrix times
*                    its inverse.
*
                     CALL zsyt03( uplo, n, a, lda, ainv, lda, work, lda,
     $                            rwork, rcondc, result( 2 ) )
                     nt = 2
                  END IF
*
*                 Print information about the tests that did not pass
*                 the threshold.
*
                  DO 110 k = 1, nt
                     IF( result( k ).GE.thresh ) THEN
                        IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
     $                     CALL alahd( nout, path )
                        WRITE( nout, fmt = 9999 )uplo, n, nb, imat, k,
     $                     result( k )
                        nfail = nfail + 1
                     END IF
  110             CONTINUE
                  nrun = nrun + nt
*
*                 Skip the other tests if this is not the first block
*                 size.
*
                  IF( inb.GT.1 )
     $               GO TO 150
*
*                 Do only the condition estimate if INFO is not 0.
*
                  IF( trfcon ) THEN
                     rcondc = zero
                     GO TO 140
                  END IF
*
*                 Do for each value of NRHS in NSVAL.
*
                  DO 130 irhs = 1, nns
                     nrhs = nsval( irhs )
*
*+    TEST 3 (Using TRS)
*                 Solve and compute residual for  A * X = B.
*
*                    Choose a set of NRHS random solution vectors
*                    stored in XACT and set up the right hand side B
*
                     srnamt = 'ZLARHS'
                     CALL zlarhs( path, xtype, uplo, ' ', n, n, kl, ku,
     $                            nrhs, a, lda, xact, lda, b, lda,
     $                            iseed, info )
                     CALL zlacpy( 'Full', n, nrhs, b, lda, x, lda )
*
                     srnamt = 'ZSYTRS'
                     CALL zsytrs( uplo, n, nrhs, afac, lda, iwork, x,
     $                            lda, info )
*
*                    Check error code from ZSYTRS and handle error.
*
                     IF( info.NE.0 )
     $                  CALL alaerh( path, 'ZSYTRS', info, 0, uplo, n,
     $                               n, -1, -1, nrhs, imat, nfail,
     $                               nerrs, nout )
*
                     CALL zlacpy( 'Full', n, nrhs, b, lda, work, lda )
*
*                    Compute the residual for the solution
*
                     CALL zsyt02( uplo, n, nrhs, a, lda, x, lda, work,
     $                            lda, rwork, result( 3 ) )
*
*+    TEST 4 (Using TRS2)
*                 Solve and compute residual for  A * X = B.
*
*                    Choose a set of NRHS random solution vectors
*                    stored in XACT and set up the right hand side B
*
                     srnamt = 'ZLARHS'
                     CALL zlarhs( path, xtype, uplo, ' ', N, N, KL, KU,
     $                            NRHS, A, LDA, XACT, LDA, B, LDA,
     $                            ISEED, INFO )
                     CALL ZLACPY( 'full', N, NRHS, B, LDA, X, LDA )
*
                     SRNAMT = 'zsytrs2'
                     CALL ZSYTRS2( UPLO, N, NRHS, AFAC, LDA, IWORK, X,
     $                            LDA, WORK, INFO )
*
*                    Check error code from ZSYTRS2 and handle error.
*
.NE.                     IF( INFO0 )
     $                  CALL ALAERH( PATH, 'zsytrs', INFO, 0, UPLO, N,
     $                               N, -1, -1, NRHS, IMAT, NFAIL,
     $                               NERRS, NOUT )
*
                     CALL ZLACPY( 'full', N, NRHS, B, LDA, WORK, LDA )
*
*                    Compute the residual for the solution
*
                     CALL ZSYT02( UPLO, N, NRHS, A, LDA, X, LDA, WORK,
     $                            LDA, RWORK, RESULT( 4 ) )
*
*
*+    TEST 5
*                 Check solution from generated exact solution.
*
                     CALL ZGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                            RESULT( 5 ) )
*
*+    TESTS 6, 7, and 8
*                 Use iterative refinement to improve the solution.
*
                     SRNAMT = 'zsyrfs'
                     CALL ZSYRFS( UPLO, N, NRHS, A, LDA, AFAC, LDA,
     $                            IWORK, B, LDA, X, LDA, RWORK,
     $                            RWORK( NRHS+1 ), WORK,
     $                            RWORK( 2*NRHS+1 ), INFO )
*
*                    Check error code from ZSYRFS and handle error.
*
.NE.                     IF( INFO0 )
     $                  CALL ALAERH( PATH, 'zsyrfs', INFO, 0, UPLO, N,
     $                               N, -1, -1, NRHS, IMAT, NFAIL,
     $                               NERRS, NOUT )
*
                     CALL ZGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                            RESULT( 6 ) )
                     CALL ZPOT05( UPLO, N, NRHS, A, LDA, B, LDA, X, LDA,
     $                            XACT, LDA, RWORK, RWORK( NRHS+1 ),
     $                            RESULT( 7 ) )
*
*                    Print information about the tests that did not pass
*                    the threshold.
*
                     DO 120 K = 3, 8
.GE.                        IF( RESULT( K )THRESH ) THEN
.EQ..AND..EQ.                           IF( NFAIL0  NERRS0 )
     $                        CALL ALAHD( NOUT, PATH )
                           WRITE( NOUT, FMT = 9998 )UPLO, N, NRHS,
     $                        IMAT, K, RESULT( K )
                           NFAIL = NFAIL + 1
                        END IF
  120                CONTINUE
                     NRUN = NRUN + 6
*
*                 End do for each value of NRHS in NSVAL.
*
  130             CONTINUE
*
*+    TEST 9
*                 Get an estimate of RCOND = 1/CNDNUM.
*
  140             CONTINUE
                  ANORM = ZLANSY( '1', UPLO, N, A, LDA, RWORK )
                  SRNAMT = 'zsycon'
                  CALL ZSYCON( UPLO, N, AFAC, LDA, IWORK, ANORM, RCOND,
     $                         WORK, INFO )
*
*                 Check error code from ZSYCON and handle error.
*
.NE.                  IF( INFO0 )
     $               CALL ALAERH( PATH, 'zsycon', INFO, 0, UPLO, N, N,
     $                            -1, -1, -1, IMAT, NFAIL, NERRS, NOUT )
*
*                 Compute the test ratio to compare values of RCOND
*
                  RESULT( 9 ) = DGET06( RCOND, RCONDC )
*
*                 Print information about the tests that did not pass
*                 the threshold.
*
.GE.                  IF( RESULT( 9 )THRESH ) THEN
.EQ..AND..EQ.                     IF( NFAIL0  NERRS0 )
     $                  CALL ALAHD( NOUT, PATH )
                     WRITE( NOUT, FMT = 9997 )UPLO, N, IMAT, 9,
     $                  RESULT( 9 )
                     NFAIL = NFAIL + 1
                  END IF
                  NRUN = NRUN + 1
  150          CONTINUE
  160       CONTINUE
  170    CONTINUE
  180 CONTINUE
*
*     Print a summary of the results.
*
      CALL ALASUM( PATH, NOUT, NFAIL, NRUN, NERRS )
*
 9999 FORMAT( ' uplo = ''', A1, ''', n =', I5, ', nb =', I4, ', type ',
     $      I2, ', test ', I2, ', ratio =', G12.5 )
 9998 FORMAT( ' uplo = ''', A1, ''', n =', I5, ', nrhs=', I3, ', type ',
     $      I2, ', test(', I2, ') =', G12.5 )
 9997 FORMAT( ' uplo = ''', A1, ''', n =', I5, ',', 10X, ' type ', I2,
     $      ', test(', I2, ') =', G12.5 )
      RETURN
*
*     End of ZCHKSY
*
      END