sckgsv.f

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*> \brief \b SCKGSV
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at 
*            http://www.netlib.org/lapack/explore-html/ 
*
*  Definition:
*  ===========
*
*       SUBROUTINE SCKGSV( NM, MVAL, PVAL, NVAL, NMATS, ISEED, THRESH,
*                          NMAX, A, AF, B, BF, U, V, Q, ALPHA, BETA, R,
*                          IWORK, WORK, RWORK, NIN, NOUT, INFO )
* 
*       .. Scalar Arguments ..
*       INTEGER            INFO, NIN, NM, NMATS, NMAX, NOUT
*       REAL               THRESH
*       ..
*       .. Array Arguments ..
*       INTEGER            ISEED( 4 ), IWORK( * ), MVAL( * ), NVAL( * ),
*      $                   PVAL( * )
*       REAL               A( * ), AF( * ), ALPHA( * ), B( * ), BETA( * ),
*      $                   BF( * ), Q( * ), R( * ), RWORK( * ), U( * ),
*      $                   V( * ), WORK( * )
*       ..
*  
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> SCKGSV tests SGGSVD:
*>        the GSVD for M-by-N matrix A and P-by-N matrix B.
*> \endverbatim
*
*  Arguments:
*  ==========
*
*> \param[in] NM
*> \verbatim
*>          NM is INTEGER
*>          The number of values of M contained in the vector MVAL.
*> \endverbatim
*>
*> \param[in] MVAL
*> \verbatim
*>          MVAL is INTEGER array, dimension (NM)
*>          The values of the matrix row dimension M.
*> \endverbatim
*>
*> \param[in] PVAL
*> \verbatim
*>          PVAL is INTEGER array, dimension (NP)
*>          The values of the matrix row dimension P.
*> \endverbatim
*>
*> \param[in] NVAL
*> \verbatim
*>          NVAL is INTEGER array, dimension (NN)
*>          The values of the matrix column dimension N.
*> \endverbatim
*>
*> \param[in] NMATS
*> \verbatim
*>          NMATS is INTEGER
*>          The number of matrix types to be tested for each combination
*>          of matrix dimensions.  If NMATS >= NTYPES (the maximum
*>          number of matrix types), then all the different types are
*>          generated for testing.  If NMATS < NTYPES, another input line
*>          is read to get the numbers of the matrix types to be used.
*> \endverbatim
*>
*> \param[in,out] ISEED
*> \verbatim
*>          ISEED is INTEGER array, dimension (4)
*>          On entry, the seed of the random number generator.  The array
*>          elements should be between 0 and 4095, otherwise they will be
*>          reduced mod 4096, and ISEED(4) must be odd.
*>          On exit, the next seed in the random number sequence after
*>          all the test matrices have been generated.
*> \endverbatim
*>
*> \param[in] THRESH
*> \verbatim
*>          THRESH is REAL
*>          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] NMAX
*> \verbatim
*>          NMAX is INTEGER
*>          The maximum value permitted for M or N, used in dimensioning
*>          the work arrays.
*> \endverbatim
*>
*> \param[out] A
*> \verbatim
*>          A is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] AF
*> \verbatim
*>          AF is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] B
*> \verbatim
*>          B is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] BF
*> \verbatim
*>          BF is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] U
*> \verbatim
*>          U is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] V
*> \verbatim
*>          V is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] Q
*> \verbatim
*>          Q is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] ALPHA
*> \verbatim
*>          ALPHA is REAL array, dimension (NMAX)
*> \endverbatim
*>
*> \param[out] BETA
*> \verbatim
*>          BETA is REAL array, dimension (NMAX)
*> \endverbatim
*>
*> \param[out] R
*> \verbatim
*>          R is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] IWORK
*> \verbatim
*>          IWORK is INTEGER array, dimension (NMAX)
*> \endverbatim
*>
*> \param[out] WORK
*> \verbatim
*>          WORK is REAL array, dimension (NMAX*NMAX)
*> \endverbatim
*>
*> \param[out] RWORK
*> \verbatim
*>          RWORK is REAL array, dimension (NMAX)
*> \endverbatim
*>
*> \param[in] NIN
*> \verbatim
*>          NIN is INTEGER
*>          The unit number for input.
*> \endverbatim
*>
*> \param[in] NOUT
*> \verbatim
*>          NOUT is INTEGER
*>          The unit number for output.
*> \endverbatim
*>
*> \param[out] INFO
*> \verbatim
*>          INFO is INTEGER
*>          = 0 :  successful exit
*>          > 0 :  If SLATMS returns an error code, the absolute value
*>                 of it is returned.
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee 
*> \author Univ. of California Berkeley 
*> \author Univ. of Colorado Denver 
*> \author NAG Ltd. 
*
*> \date November 2015
*
*> \ingroup single_eig
*
*  =====================================================================
      SUBROUTINE sckgsv( NM, MVAL, PVAL, NVAL, NMATS, ISEED, THRESH,
     $                   nmax, a, af, b, bf, u, v, q, alpha, beta, r,
     $                   iwork, work, rwork, nin, nout, info )
*
*  -- LAPACK test routine (version 3.6.0) --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     November 2015
*
*     .. Scalar Arguments ..
      INTEGER            INFO, NIN, NM, NMATS, NMAX, NOUT
      REAL               THRESH
*     ..
*     .. Array Arguments ..
      INTEGER            ISEED( 4 ), IWORK( * ), MVAL( * ), NVAL( * ),
     $                   pval( * )
      REAL               A( * ), AF( * ), ALPHA( * ), B( * ), BETA( * ),
     $                   bf( * ), q( * ), r( * ), rwork( * ), u( * ),
     $                   v( * ), work( * )
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            NTESTS
      parameter                ( ntests = 12 )
      INTEGER            NTYPES
      parameter                ( ntypes = 8 )
*     ..
*     .. Local Scalars ..
      LOGICAL            FIRSTT
      CHARACTER          DISTA, DISTB, TYPE
      CHARACTER*3        PATH
      INTEGER            I, IINFO, IM, IMAT, KLA, KLB, KUA, KUB, LDA,
     $                   ldb, ldq, ldr, ldu, ldv, lwork, m, modea,
     $                   modeb, n, nfail, nrun, nt, p
      REAL               ANORM, BNORM, CNDNMA, CNDNMB
*     ..
*     .. Local Arrays ..
      LOGICAL            DOTYPE( ntypes )
      REAL               RESULT( ntests )
*     ..
*     .. External Subroutines ..
      EXTERNAL           alahdg, alareq, alasum, sgsvts3, slatb9, slatms
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          abs
*     ..
*     .. Executable Statements ..
*
*     Initialize constants and the random number seed.
*
      path( 1: 3 ) = 'GSV'
      info = 0
      nrun = 0
      nfail = 0
      firstt = .true.
      CALL alareq( path, nmats, dotype, ntypes, nin, nout )
      lda = nmax
      ldb = nmax
      ldu = nmax
      ldv = nmax
      ldq = nmax
      ldr = nmax
      lwork = nmax*nmax
*
*     Do for each value of M in MVAL.
*
      DO 30 im = 1, nm
         m = mval( im )
         p = pval( im )
         n = nval( im )
*
         DO 20 imat = 1, ntypes
*
*           Do the tests only if DOTYPE( IMAT ) is true.
*
            IF( .NOT.dotype( imat ) )
     $         GO TO 20
*
*           Set up parameters with SLATB9 and generate test
*           matrices A and B with SLATMS.
*
            CALL slatb9( path, imat, m, p, n, TYPE, KLA, KUA, KLB, KUB,
     $                   anorm, bnorm, modea, modeb, cndnma, cndnmb,
     $                   dista, distb )
*
*           Generate M by N matrix A
*
            CALL slatms( m, n, dista, iseed, TYPE, RWORK, MODEA, CNDNMA,
     $                   anorm, kla, kua, 'No packing', a, lda, work,
     $                   iinfo )
            IF( iinfo.NE.0 ) THEN
               WRITE( nout, fmt = 9999 )iinfo
               info = abs( iinfo )
               GO TO 20
            END IF
*
            CALL slatms( p, n, distb, iseed, TYPE, RWORK, MODEB, CNDNMB,
     $                   bnorm, klb, kub, 'No packing', b, ldb, work,
     $                   iinfo )
            IF( iinfo.NE.0 ) THEN
               WRITE( nout, fmt = 9999 )iinfo
               info = abs( iinfo )
               GO TO 20
            END IF
*
            nt = 6
*
            CALL sgsvts3( m, p, n, a, af, lda, b, bf, ldb, u, ldu, v,
     $                    ldv, q, ldq, alpha, beta, r, ldr, iwork, work,
     $                    lwork, rwork, result )
*
*           Print information about the tests that did not
*           pass the threshold.
*
            DO 10 i = 1, nt
               IF( result( i ).GE.thresh ) THEN
                  IF( nfail.EQ.0 .AND. firstt ) THEN
                     firstt = .false.
                     CALL alahdg( nout, path )
                  END IF
                  WRITE( nout, fmt = 9998 )m, p, n, imat, i,
     $               result( i )
                  nfail = nfail + 1
               END IF
   10       CONTINUE
            nrun = nrun + nt
   20    CONTINUE
   30 CONTINUE
*
*     Print a summary of the results.
*
      CALL alasum( path, nout, nfail, nrun, 0 )
*
 9999 FORMAT( ' SLATMS in SCKGSV   INFO = ', i5 )
 9998 FORMAT( ' M=', i4, ' P=', i4, ', N=', i4, ', type ', i2,
     $      ', test ', i2, ', ratio=', g13.6 )
      RETURN
*
*     End of SCKGSV
*
      END