dchkec()

subroutine dchkec	(	double precision	thresh,
		logical	tsterr,
		integer	nin,
		integer	nout
	)

DCHKEC

Purpose:

 DCHKEC tests eigen- condition estimation routines
        DLALN2, DLASY2, DLANV2, DLAQTR, DLAEXC,
        DTRSYL, DTREXC, DTRSNA, DTRSEN, DTGEXC

 In all cases, the routine runs through a fixed set of numerical
 examples, subjects them to various tests, and compares the test
 results to a threshold THRESH. In addition, DTREXC, DTRSNA and DTRSEN
 are tested by reading in precomputed examples from a file (on input
 unit NIN).  Output is written to output unit NOUT.

Parameters

[in]	THRESH	THRESH is DOUBLE PRECISION Threshold for residual tests. A computed test ratio passes the threshold if it is less than THRESH.
[in]	TSTERR	TSTERR is LOGICAL Flag that indicates whether error exits are to be tested.
[in]	NIN	NIN is INTEGER The logical unit number for input.
[in]	NOUT	NOUT is INTEGER The logical unit number for output.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 75 of file dchkec.f.

*
*  -- 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            NIN, NOUT
      DOUBLE PRECISION   THRESH
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      LOGICAL            OK
      CHARACTER*3        PATH
      INTEGER            KLAEXC, KLALN2, KLANV2, KLAQTR, KLASY2, KTREXC,
     $                   KTRSEN, KTRSNA, KTRSYL, KTRSYL3, LLAEXC,
     $                   LLALN2, LLANV2, LLAQTR, LLASY2, LTREXC, LTRSYL,
     $                   NLANV2, NLAQTR, NLASY2, NTESTS, NTRSYL, KTGEXC,
     $                   LTGEXC
      DOUBLE PRECISION   EPS, RLAEXC, RLALN2, RLANV2, RLAQTR, RLASY2,
     $                   RTREXC, SFMIN, RTGEXC
*     ..
*     .. Local Arrays ..
      INTEGER            FTRSYL( 3 ), ITRSYL( 2 ), LTRSEN( 3 ),
     $                   LTRSNA( 3 ), NLAEXC( 2 ), NLALN2( 2 ),
     $                   NTGEXC( 2 ), NTREXC( 3 ), NTRSEN( 3 ),
     $                   NTRSNA( 3 )
      DOUBLE PRECISION   RTRSEN( 3 ), RTRSNA( 3 ), RTRSYL( 2 )
*     ..
*     .. External Subroutines ..
      EXTERNAL           derrec, dget31, dget32, dget33, dget34, dget35,
     $                   dget36, dget37, dget38, dget39, dget40, dsyl01
*     ..
*     .. External Functions ..
      DOUBLE PRECISION   DLAMCH
      EXTERNAL           dlamch
*     ..
*     .. Executable Statements ..
*
      path( 1: 1 ) = 'Double precision'
      path( 2: 3 ) = 'EC'
      eps = dlamch( 'P' )
      sfmin = dlamch( 'S' )
*
*     Print header information
*
      WRITE( nout, fmt = 9989 )
      WRITE( nout, fmt = 9988 )eps, sfmin
      WRITE( nout, fmt = 9987 )thresh
*
*     Test error exits if TSTERR is .TRUE.
*
      IF( tsterr )
     $   CALL derrec( path, nout )
*
      ok = .true.
      CALL dget31( rlaln2, llaln2, nlaln2, klaln2 )
      IF( rlaln2.GT.thresh .OR. nlaln2( 1 ).NE.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9999 )rlaln2, llaln2, nlaln2, klaln2
      END IF
*
      CALL dget32( rlasy2, llasy2, nlasy2, klasy2 )
      IF( rlasy2.GT.thresh ) THEN
         ok = .false.
         WRITE( nout, fmt = 9998 )rlasy2, llasy2, nlasy2, klasy2
      END IF
*
      CALL dget33( rlanv2, llanv2, nlanv2, klanv2 )
      IF( rlanv2.GT.thresh .OR. nlanv2.NE.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9997 )rlanv2, llanv2, nlanv2, klanv2
      END IF
*
      CALL dget34( rlaexc, llaexc, nlaexc, klaexc )
      IF( rlaexc.GT.thresh .OR. nlaexc( 2 ).NE.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9996 )rlaexc, llaexc, nlaexc, klaexc
      END IF
*
      CALL dget35( rtrsyl( 1 ), ltrsyl, ntrsyl, ktrsyl )
      IF( rtrsyl( 1 ).GT.thresh ) THEN
         ok = .false.
         WRITE( nout, fmt = 9995 )rtrsyl( 1 ), ltrsyl, ntrsyl, ktrsyl
      END IF
*
      CALL dsyl01( thresh, ftrsyl, rtrsyl, itrsyl, ktrsyl3 )
      IF( ftrsyl( 1 ).GT.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9970 )ftrsyl( 1 ), rtrsyl( 1 ), thresh
      END IF
      IF( ftrsyl( 2 ).GT.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9971 )ftrsyl( 2 ), rtrsyl( 2 ), thresh
      END IF
      IF( ftrsyl( 3 ).GT.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9972 )ftrsyl( 3 )
      END IF
*
      CALL dget36( rtrexc, ltrexc, ntrexc, ktrexc, nin )
      IF( rtrexc.GT.thresh .OR. ntrexc( 3 ).GT.0 ) THEN
         ok = .false.
         WRITE( nout, fmt = 9994 )rtrexc, ltrexc, ntrexc, ktrexc
      END IF
*
      CALL dget37( rtrsna, ltrsna, ntrsna, ktrsna, nin )
      IF( rtrsna( 1 ).GT.thresh .OR. rtrsna( 2 ).GT.thresh .OR.
     $    ntrsna( 1 ).NE.0 .OR. ntrsna( 2 ).NE.0 .OR. ntrsna( 3 ).NE.0 )
     $     THEN
         ok = .false.
         WRITE( nout, fmt = 9993 )rtrsna, ltrsna, ntrsna, ktrsna
      END IF
*
      CALL dget38( rtrsen, ltrsen, ntrsen, ktrsen, nin )
      IF( rtrsen( 1 ).GT.thresh .OR. rtrsen( 2 ).GT.thresh .OR.
     $    ntrsen( 1 ).NE.0 .OR. ntrsen( 2 ).NE.0 .OR. ntrsen( 3 ).NE.0 )
     $     THEN
         ok = .false.
         WRITE( nout, fmt = 9992 )rtrsen, ltrsen, ntrsen, ktrsen
      END IF
*
      CALL dget39( rlaqtr, llaqtr, nlaqtr, klaqtr )
      IF( rlaqtr.GT.thresh ) THEN
         ok = .false.
         WRITE( nout, fmt = 9991 )rlaqtr, llaqtr, nlaqtr, klaqtr
      END IF
*
      CALL dget40( rtgexc, ltgexc, ntgexc, ktgexc, nin )
      IF( rtgexc.GT.thresh ) THEN
         ok = .false.
         WRITE( nout, fmt = 9986 )rtgexc, ltgexc, ntgexc, ktgexc
      END IF
*
      ntests = klaln2 + klasy2 + klanv2 + klaexc + ktrsyl + ktrexc +
     $         ktrsna + ktrsen + klaqtr + ktgexc
      IF( ok )
     $   WRITE( nout, fmt = 9990 )path, ntests
*
      RETURN
 9999 FORMAT( ' Error in DLALN2: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', 2i8, ' KNT=', i8 )
 9998 FORMAT( ' Error in DLASY2: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', i8, ' KNT=', i8 )
 9997 FORMAT( ' Error in DLANV2: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', i8, ' KNT=', i8 )
 9996 FORMAT( ' Error in DLAEXC: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', 2i8, ' KNT=', i8 )
 9995 FORMAT( ' Error in DTRSYL: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', i8, ' KNT=', i8 )
 9994 FORMAT( ' Error in DTREXC: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', 3i8, ' KNT=', i8 )
 9993 FORMAT( ' Error in DTRSNA: RMAX =', 3d12.3, / ' LMAX = ', 3i8,
     $      ' NINFO=', 3i8, ' KNT=', i8 )
 9992 FORMAT( ' Error in DTRSEN: RMAX =', 3d12.3, / ' LMAX = ', 3i8,
     $      ' NINFO=', 3i8, ' KNT=', i8 )
 9991 FORMAT( ' Error in DLAQTR: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', i8, ' KNT=', i8 )
 9990 FORMAT( / 1x, 'All tests for ', a3, ' routines passed the thresh',
     $      'old ( ', i6, ' tests run)' )
 9989 FORMAT( ' Tests of the Nonsymmetric eigenproblem condition estim',
     $      'ation routines', / ' DLALN2, DLASY2, DLANV2, DLAEXC, DTRS',
     $      'YL, DTREXC, DTRSNA, DTRSEN, DLAQTR, DTGEXC', / )
 9988 FORMAT( ' Relative machine precision (EPS) = ', d16.6, / ' Safe ',
     $      'minimum (SFMIN)             = ', d16.6, / )
 9987 FORMAT( ' Routines pass computational tests if test ratio is les',
     $      's than', f8.2, / / )
 9986 FORMAT( ' Error in DTGEXC: RMAX =', d12.3, / ' LMAX = ', i8, ' N',
     $      'INFO=', 2i8, ' KNT=', i8 )
 9972 FORMAT( 'DTRSYL and DTRSYL3 compute an inconsistent result ',
     $      'factor in ', i8, ' tests.')
 9971 FORMAT( 'Error in DTRSYL3: ', i8, ' tests fail the threshold.', /
     $      'Maximum test ratio =', d12.3, ' threshold =', d12.3 )
 9970 FORMAT( 'Error in DTRSYL: ', i8, ' tests fail the threshold.', /
     $      'Maximum test ratio =', d12.3, ' threshold =', d12.3 )
*
*     End of DCHKEC
*

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