LAPACK  3.9.0
LAPACK: Linear Algebra PACKage
zchkgb.f
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1 *> \brief \b ZCHKGB
2 *
3 * =========== DOCUMENTATION ===========
4 *
5 * Online html documentation available at
6 * http://www.netlib.org/lapack/explore-html/
7 *
8 * Definition:
9 * ===========
10 *
11 * SUBROUTINE ZCHKGB( DOTYPE, NM, MVAL, NN, NVAL, NNB, NBVAL, NNS,
12 * NSVAL, THRESH, TSTERR, A, LA, AFAC, LAFAC, B,
13 * X, XACT, WORK, RWORK, IWORK, NOUT )
14 *
15 * .. Scalar Arguments ..
16 * LOGICAL TSTERR
17 * INTEGER LA, LAFAC, NM, NN, NNB, NNS, NOUT
18 * DOUBLE PRECISION THRESH
19 * ..
20 * .. Array Arguments ..
21 * LOGICAL DOTYPE( * )
22 * INTEGER IWORK( * ), MVAL( * ), NBVAL( * ), NSVAL( * ),
23 * $ NVAL( * )
24 * DOUBLE PRECISION RWORK( * )
25 * COMPLEX*16 A( * ), AFAC( * ), B( * ), WORK( * ), X( * ),
26 * $ XACT( * )
27 * ..
28 *
29 *
30 *> \par Purpose:
31 * =============
32 *>
33 *> \verbatim
34 *>
35 *> ZCHKGB tests ZGBTRF, -TRS, -RFS, and -CON
36 *> \endverbatim
37 *
38 * Arguments:
39 * ==========
40 *
41 *> \param[in] DOTYPE
42 *> \verbatim
43 *> DOTYPE is LOGICAL array, dimension (NTYPES)
44 *> The matrix types to be used for testing. Matrices of type j
45 *> (for 1 <= j <= NTYPES) are used for testing if DOTYPE(j) =
46 *> .TRUE.; if DOTYPE(j) = .FALSE., then type j is not used.
47 *> \endverbatim
48 *>
49 *> \param[in] NM
50 *> \verbatim
51 *> NM is INTEGER
52 *> The number of values of M contained in the vector MVAL.
53 *> \endverbatim
54 *>
55 *> \param[in] MVAL
56 *> \verbatim
57 *> MVAL is INTEGER array, dimension (NM)
58 *> The values of the matrix row dimension M.
59 *> \endverbatim
60 *>
61 *> \param[in] NN
62 *> \verbatim
63 *> NN is INTEGER
64 *> The number of values of N contained in the vector NVAL.
65 *> \endverbatim
66 *>
67 *> \param[in] NVAL
68 *> \verbatim
69 *> NVAL is INTEGER array, dimension (NN)
70 *> The values of the matrix column dimension N.
71 *> \endverbatim
72 *>
73 *> \param[in] NNB
74 *> \verbatim
75 *> NNB is INTEGER
76 *> The number of values of NB contained in the vector NBVAL.
77 *> \endverbatim
78 *>
79 *> \param[in] NBVAL
80 *> \verbatim
81 *> NBVAL is INTEGER array, dimension (NBVAL)
82 *> The values of the blocksize NB.
83 *> \endverbatim
84 *>
85 *> \param[in] NNS
86 *> \verbatim
87 *> NNS is INTEGER
88 *> The number of values of NRHS contained in the vector NSVAL.
89 *> \endverbatim
90 *>
91 *> \param[in] NSVAL
92 *> \verbatim
93 *> NSVAL is INTEGER array, dimension (NNS)
94 *> The values of the number of right hand sides NRHS.
95 *> \endverbatim
96 *>
97 *> \param[in] THRESH
98 *> \verbatim
99 *> THRESH is DOUBLE PRECISION
100 *> The threshold value for the test ratios. A result is
101 *> included in the output file if RESULT >= THRESH. To have
102 *> every test ratio printed, use THRESH = 0.
103 *> \endverbatim
104 *>
105 *> \param[in] TSTERR
106 *> \verbatim
107 *> TSTERR is LOGICAL
108 *> Flag that indicates whether error exits are to be tested.
109 *> \endverbatim
110 *>
111 *> \param[out] A
112 *> \verbatim
113 *> A is COMPLEX*16 array, dimension (LA)
114 *> \endverbatim
115 *>
116 *> \param[in] LA
117 *> \verbatim
118 *> LA is INTEGER
119 *> The length of the array A. LA >= (KLMAX+KUMAX+1)*NMAX
120 *> where KLMAX is the largest entry in the local array KLVAL,
121 *> KUMAX is the largest entry in the local array KUVAL and
122 *> NMAX is the largest entry in the input array NVAL.
123 *> \endverbatim
124 *>
125 *> \param[out] AFAC
126 *> \verbatim
127 *> AFAC is COMPLEX*16 array, dimension (LAFAC)
128 *> \endverbatim
129 *>
130 *> \param[in] LAFAC
131 *> \verbatim
132 *> LAFAC is INTEGER
133 *> The length of the array AFAC. LAFAC >= (2*KLMAX+KUMAX+1)*NMAX
134 *> where KLMAX is the largest entry in the local array KLVAL,
135 *> KUMAX is the largest entry in the local array KUVAL and
136 *> NMAX is the largest entry in the input array NVAL.
137 *> \endverbatim
138 *>
139 *> \param[out] B
140 *> \verbatim
141 *> B is COMPLEX*16 array, dimension (NMAX*NSMAX)
142 *> \endverbatim
143 *>
144 *> \param[out] X
145 *> \verbatim
146 *> X is COMPLEX*16 array, dimension (NMAX*NSMAX)
147 *> \endverbatim
148 *>
149 *> \param[out] XACT
150 *> \verbatim
151 *> XACT is COMPLEX*16 array, dimension (NMAX*NSMAX)
152 *> \endverbatim
153 *>
154 *> \param[out] WORK
155 *> \verbatim
156 *> WORK is COMPLEX*16 array, dimension
157 *> (NMAX*max(3,NSMAX,NMAX))
158 *> \endverbatim
159 *>
160 *> \param[out] RWORK
161 *> \verbatim
162 *> RWORK is DOUBLE PRECISION array, dimension
163 *> (max(NMAX,2*NSMAX))
164 *> \endverbatim
165 *>
166 *> \param[out] IWORK
167 *> \verbatim
168 *> IWORK is INTEGER array, dimension (NMAX)
169 *> \endverbatim
170 *>
171 *> \param[in] NOUT
172 *> \verbatim
173 *> NOUT is INTEGER
174 *> The unit number for output.
175 *> \endverbatim
176 *
177 * Authors:
178 * ========
179 *
180 *> \author Univ. of Tennessee
181 *> \author Univ. of California Berkeley
182 *> \author Univ. of Colorado Denver
183 *> \author NAG Ltd.
184 *
185 *> \date December 2016
186 *
187 *> \ingroup complex16_lin
188 *
189 * =====================================================================
190  SUBROUTINE zchkgb( DOTYPE, NM, MVAL, NN, NVAL, NNB, NBVAL, NNS,
191  $ NSVAL, THRESH, TSTERR, A, LA, AFAC, LAFAC, B,
192  $ X, XACT, WORK, RWORK, IWORK, NOUT )
193 *
194 * -- LAPACK test routine (version 3.7.0) --
195 * -- LAPACK is a software package provided by Univ. of Tennessee, --
196 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
197 * December 2016
198 *
199 * .. Scalar Arguments ..
200  LOGICAL TSTERR
201  INTEGER LA, LAFAC, NM, NN, NNB, NNS, NOUT
202  DOUBLE PRECISION THRESH
203 * ..
204 * .. Array Arguments ..
205  LOGICAL DOTYPE( * )
206  INTEGER IWORK( * ), MVAL( * ), NBVAL( * ), NSVAL( * ),
207  $ nval( * )
208  DOUBLE PRECISION RWORK( * )
209  COMPLEX*16 A( * ), AFAC( * ), B( * ), WORK( * ), X( * ),
210  $ xact( * )
211 * ..
212 *
213 * =====================================================================
214 *
215 * .. Parameters ..
216  DOUBLE PRECISION ONE, ZERO
217  PARAMETER ( ONE = 1.0d+0, zero = 0.0d+0 )
218  INTEGER NTYPES, NTESTS
219  parameter( ntypes = 8, ntests = 7 )
220  INTEGER NBW, NTRAN
221  parameter( nbw = 4, ntran = 3 )
222 * ..
223 * .. Local Scalars ..
224  LOGICAL TRFCON, ZEROT
225  CHARACTER DIST, NORM, TRANS, TYPE, XTYPE
226  CHARACTER*3 PATH
227  INTEGER I, I1, I2, IKL, IKU, IM, IMAT, IN, INB, INFO,
228  $ ioff, irhs, itran, izero, j, k, kl, koff, ku,
229  $ lda, ldafac, ldb, m, mode, n, nb, nerrs, nfail,
230  $ nimat, nkl, nku, nrhs, nrun
231  DOUBLE PRECISION AINVNM, ANORM, ANORMI, ANORMO, CNDNUM, RCOND,
232  $ RCONDC, RCONDI, RCONDO
233 * ..
234 * .. Local Arrays ..
235  CHARACTER TRANSS( NTRAN )
236  INTEGER ISEED( 4 ), ISEEDY( 4 ), KLVAL( NBW ),
237  $ kuval( nbw )
238  DOUBLE PRECISION RESULT( NTESTS )
239 * ..
240 * .. External Functions ..
241  DOUBLE PRECISION DGET06, ZLANGB, ZLANGE
242  EXTERNAL DGET06, ZLANGB, ZLANGE
243 * ..
244 * .. External Subroutines ..
245  EXTERNAL alaerh, alahd, alasum, xlaenv, zcopy, zerrge,
246  $ zgbcon, zgbrfs, zgbt01, zgbt02, zgbt05, zgbtrf,
247  $ zgbtrs, zget04, zlacpy, zlarhs, zlaset, zlatb4,
248  $ zlatms
249 * ..
250 * .. Intrinsic Functions ..
251  INTRINSIC dcmplx, max, min
252 * ..
253 * .. Scalars in Common ..
254  LOGICAL LERR, OK
255  CHARACTER*32 SRNAMT
256  INTEGER INFOT, NUNIT
257 * ..
258 * .. Common blocks ..
259  COMMON / infoc / infot, nunit, ok, lerr
260  COMMON / srnamc / srnamt
261 * ..
262 * .. Data statements ..
263  DATA iseedy / 1988, 1989, 1990, 1991 / ,
264  $ transs / 'N', 'T', 'C' /
265 * ..
266 * .. Executable Statements ..
267 *
268 * Initialize constants and the random number seed.
269 *
270  path( 1: 1 ) = 'Zomplex precision'
271  path( 2: 3 ) = 'GB'
272  nrun = 0
273  nfail = 0
274  nerrs = 0
275  DO 10 i = 1, 4
276  iseed( i ) = iseedy( i )
277  10 CONTINUE
278 *
279 * Test the error exits
280 *
281  IF( tsterr )
282  $ CALL zerrge( path, nout )
283  infot = 0
284 *
285 * Initialize the first value for the lower and upper bandwidths.
286 *
287  klval( 1 ) = 0
288  kuval( 1 ) = 0
289 *
290 * Do for each value of M in MVAL
291 *
292  DO 160 im = 1, nm
293  m = mval( im )
294 *
295 * Set values to use for the lower bandwidth.
296 *
297  klval( 2 ) = m + ( m+1 ) / 4
298 *
299 * KLVAL( 2 ) = MAX( M-1, 0 )
300 *
301  klval( 3 ) = ( 3*m-1 ) / 4
302  klval( 4 ) = ( m+1 ) / 4
303 *
304 * Do for each value of N in NVAL
305 *
306  DO 150 in = 1, nn
307  n = nval( in )
308  xtype = 'N'
309 *
310 * Set values to use for the upper bandwidth.
311 *
312  kuval( 2 ) = n + ( n+1 ) / 4
313 *
314 * KUVAL( 2 ) = MAX( N-1, 0 )
315 *
316  kuval( 3 ) = ( 3*n-1 ) / 4
317  kuval( 4 ) = ( n+1 ) / 4
318 *
319 * Set limits on the number of loop iterations.
320 *
321  nkl = min( m+1, 4 )
322  IF( n.EQ.0 )
323  $ nkl = 2
324  nku = min( n+1, 4 )
325  IF( m.EQ.0 )
326  $ nku = 2
327  nimat = ntypes
328  IF( m.LE.0 .OR. n.LE.0 )
329  $ nimat = 1
330 *
331  DO 140 ikl = 1, nkl
332 *
333 * Do for KL = 0, (5*M+1)/4, (3M-1)/4, and (M+1)/4. This
334 * order makes it easier to skip redundant values for small
335 * values of M.
336 *
337  kl = klval( ikl )
338  DO 130 iku = 1, nku
339 *
340 * Do for KU = 0, (5*N+1)/4, (3N-1)/4, and (N+1)/4. This
341 * order makes it easier to skip redundant values for
342 * small values of N.
343 *
344  ku = kuval( iku )
345 *
346 * Check that A and AFAC are big enough to generate this
347 * matrix.
348 *
349  lda = kl + ku + 1
350  ldafac = 2*kl + ku + 1
351  IF( ( lda*n ).GT.la .OR. ( ldafac*n ).GT.lafac ) THEN
352  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
353  $ CALL alahd( nout, path )
354  IF( n*( kl+ku+1 ).GT.la ) THEN
355  WRITE( nout, fmt = 9999 )la, m, n, kl, ku,
356  $ n*( kl+ku+1 )
357  nerrs = nerrs + 1
358  END IF
359  IF( n*( 2*kl+ku+1 ).GT.lafac ) THEN
360  WRITE( nout, fmt = 9998 )lafac, m, n, kl, ku,
361  $ n*( 2*kl+ku+1 )
362  nerrs = nerrs + 1
363  END IF
364  GO TO 130
365  END IF
366 *
367  DO 120 imat = 1, nimat
368 *
369 * Do the tests only if DOTYPE( IMAT ) is true.
370 *
371  IF( .NOT.dotype( imat ) )
372  $ GO TO 120
373 *
374 * Skip types 2, 3, or 4 if the matrix size is too
375 * small.
376 *
377  zerot = imat.GE.2 .AND. imat.LE.4
378  IF( zerot .AND. n.LT.imat-1 )
379  $ GO TO 120
380 *
381  IF( .NOT.zerot .OR. .NOT.dotype( 1 ) ) THEN
382 *
383 * Set up parameters with ZLATB4 and generate a
384 * test matrix with ZLATMS.
385 *
386  CALL zlatb4( path, imat, m, n, TYPE, kl, ku,
387  $ anorm, mode, cndnum, dist )
388 *
389  koff = max( 1, ku+2-n )
390  DO 20 i = 1, koff - 1
391  a( i ) = zero
392  20 CONTINUE
393  srnamt = 'ZLATMS'
394  CALL zlatms( m, n, dist, iseed, TYPE, rwork,
395  $ mode, cndnum, anorm, kl, ku, 'Z',
396  $ a( koff ), lda, work, info )
397 *
398 * Check the error code from ZLATMS.
399 *
400  IF( info.NE.0 ) THEN
401  CALL alaerh( path, 'ZLATMS', info, 0, ' ', m,
402  $ n, kl, ku, -1, imat, nfail,
403  $ nerrs, nout )
404  GO TO 120
405  END IF
406  ELSE IF( izero.GT.0 ) THEN
407 *
408 * Use the same matrix for types 3 and 4 as for
409 * type 2 by copying back the zeroed out column.
410 *
411  CALL zcopy( i2-i1+1, b, 1, a( ioff+i1 ), 1 )
412  END IF
413 *
414 * For types 2, 3, and 4, zero one or more columns of
415 * the matrix to test that INFO is returned correctly.
416 *
417  izero = 0
418  IF( zerot ) THEN
419  IF( imat.EQ.2 ) THEN
420  izero = 1
421  ELSE IF( imat.EQ.3 ) THEN
422  izero = min( m, n )
423  ELSE
424  izero = min( m, n ) / 2 + 1
425  END IF
426  ioff = ( izero-1 )*lda
427  IF( imat.LT.4 ) THEN
428 *
429 * Store the column to be zeroed out in B.
430 *
431  i1 = max( 1, ku+2-izero )
432  i2 = min( kl+ku+1, ku+1+( m-izero ) )
433  CALL zcopy( i2-i1+1, a( ioff+i1 ), 1, b, 1 )
434 *
435  DO 30 i = i1, i2
436  a( ioff+i ) = zero
437  30 CONTINUE
438  ELSE
439  DO 50 j = izero, n
440  DO 40 i = max( 1, ku+2-j ),
441  $ min( kl+ku+1, ku+1+( m-j ) )
442  a( ioff+i ) = zero
443  40 CONTINUE
444  ioff = ioff + lda
445  50 CONTINUE
446  END IF
447  END IF
448 *
449 * These lines, if used in place of the calls in the
450 * loop over INB, cause the code to bomb on a Sun
451 * SPARCstation.
452 *
453 * ANORMO = ZLANGB( 'O', N, KL, KU, A, LDA, RWORK )
454 * ANORMI = ZLANGB( 'I', N, KL, KU, A, LDA, RWORK )
455 *
456 * Do for each blocksize in NBVAL
457 *
458  DO 110 inb = 1, nnb
459  nb = nbval( inb )
460  CALL xlaenv( 1, nb )
461 *
462 * Compute the LU factorization of the band matrix.
463 *
464  IF( m.GT.0 .AND. n.GT.0 )
465  $ CALL zlacpy( 'Full', kl+ku+1, n, a, lda,
466  $ afac( kl+1 ), ldafac )
467  srnamt = 'ZGBTRF'
468  CALL zgbtrf( m, n, kl, ku, afac, ldafac, iwork,
469  $ info )
470 *
471 * Check error code from ZGBTRF.
472 *
473  IF( info.NE.izero )
474  $ CALL alaerh( path, 'ZGBTRF', info, izero,
475  $ ' ', m, n, kl, ku, nb, imat,
476  $ nfail, nerrs, nout )
477  trfcon = .false.
478 *
479 *+ TEST 1
480 * Reconstruct matrix from factors and compute
481 * residual.
482 *
483  CALL zgbt01( m, n, kl, ku, a, lda, afac, ldafac,
484  $ iwork, work, result( 1 ) )
485 *
486 * Print information about the tests so far that
487 * did not pass the threshold.
488 *
489  IF( result( 1 ).GE.thresh ) THEN
490  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
491  $ CALL alahd( nout, path )
492  WRITE( nout, fmt = 9997 )m, n, kl, ku, nb,
493  $ imat, 1, result( 1 )
494  nfail = nfail + 1
495  END IF
496  nrun = nrun + 1
497 *
498 * Skip the remaining tests if this is not the
499 * first block size or if M .ne. N.
500 *
501  IF( inb.GT.1 .OR. m.NE.n )
502  $ GO TO 110
503 *
504  anormo = zlangb( 'O', n, kl, ku, a, lda, rwork )
505  anormi = zlangb( 'I', n, kl, ku, a, lda, rwork )
506 *
507  IF( info.EQ.0 ) THEN
508 *
509 * Form the inverse of A so we can get a good
510 * estimate of CNDNUM = norm(A) * norm(inv(A)).
511 *
512  ldb = max( 1, n )
513  CALL zlaset( 'Full', n, n, dcmplx( zero ),
514  $ dcmplx( one ), work, ldb )
515  srnamt = 'ZGBTRS'
516  CALL zgbtrs( 'No transpose', n, kl, ku, n,
517  $ afac, ldafac, iwork, work, ldb,
518  $ info )
519 *
520 * Compute the 1-norm condition number of A.
521 *
522  ainvnm = zlange( 'O', n, n, work, ldb,
523  $ rwork )
524  IF( anormo.LE.zero .OR. ainvnm.LE.zero ) THEN
525  rcondo = one
526  ELSE
527  rcondo = ( one / anormo ) / ainvnm
528  END IF
529 *
530 * Compute the infinity-norm condition number of
531 * A.
532 *
533  ainvnm = zlange( 'I', n, n, work, ldb,
534  $ rwork )
535  IF( anormi.LE.zero .OR. ainvnm.LE.zero ) THEN
536  rcondi = one
537  ELSE
538  rcondi = ( one / anormi ) / ainvnm
539  END IF
540  ELSE
541 *
542 * Do only the condition estimate if INFO.NE.0.
543 *
544  trfcon = .true.
545  rcondo = zero
546  rcondi = zero
547  END IF
548 *
549 * Skip the solve tests if the matrix is singular.
550 *
551  IF( trfcon )
552  $ GO TO 90
553 *
554  DO 80 irhs = 1, nns
555  nrhs = nsval( irhs )
556  xtype = 'N'
557 *
558  DO 70 itran = 1, ntran
559  trans = transs( itran )
560  IF( itran.EQ.1 ) THEN
561  rcondc = rcondo
562  norm = 'O'
563  ELSE
564  rcondc = rcondi
565  norm = 'I'
566  END IF
567 *
568 *+ TEST 2:
569 * Solve and compute residual for A * X = B.
570 *
571  srnamt = 'ZLARHS'
572  CALL zlarhs( path, xtype, ' ', trans, n,
573  $ n, kl, ku, nrhs, a, lda,
574  $ xact, ldb, b, ldb, iseed,
575  $ info )
576  xtype = 'C'
577  CALL zlacpy( 'Full', n, nrhs, b, ldb, x,
578  $ ldb )
579 *
580  srnamt = 'ZGBTRS'
581  CALL zgbtrs( trans, n, kl, ku, nrhs, afac,
582  $ ldafac, iwork, x, ldb, info )
583 *
584 * Check error code from ZGBTRS.
585 *
586  IF( info.NE.0 )
587  $ CALL alaerh( path, 'ZGBTRS', info, 0,
588  $ trans, n, n, kl, ku, -1,
589  $ imat, nfail, nerrs, nout )
590 *
591  CALL zlacpy( 'Full', n, nrhs, b, ldb,
592  $ work, ldb )
593  CALL zgbt02( trans, m, n, kl, ku, nrhs, a,
594  $ lda, x, ldb, work, ldb,
595  $ result( 2 ) )
596 *
597 *+ TEST 3:
598 * Check solution from generated exact
599 * solution.
600 *
601  CALL zget04( n, nrhs, x, ldb, xact, ldb,
602  $ rcondc, result( 3 ) )
603 *
604 *+ TESTS 4, 5, 6:
605 * Use iterative refinement to improve the
606 * solution.
607 *
608  srnamt = 'ZGBRFS'
609  CALL zgbrfs( trans, n, kl, ku, nrhs, a,
610  $ lda, afac, ldafac, iwork, b,
611  $ ldb, x, ldb, rwork,
612  $ rwork( nrhs+1 ), work,
613  $ rwork( 2*nrhs+1 ), info )
614 *
615 * Check error code from ZGBRFS.
616 *
617  IF( info.NE.0 )
618  $ CALL alaerh( path, 'ZGBRFS', info, 0,
619  $ trans, n, n, kl, ku, nrhs,
620  $ imat, nfail, nerrs, nout )
621 *
622  CALL zget04( n, nrhs, x, ldb, xact, ldb,
623  $ rcondc, result( 4 ) )
624  CALL zgbt05( trans, n, kl, ku, nrhs, a,
625  $ lda, b, ldb, x, ldb, xact,
626  $ ldb, rwork, rwork( nrhs+1 ),
627  $ result( 5 ) )
628 *
629 * Print information about the tests that did
630 * not pass the threshold.
631 *
632  DO 60 k = 2, 6
633  IF( result( k ).GE.thresh ) THEN
634  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
635  $ CALL alahd( nout, path )
636  WRITE( nout, fmt = 9996 )trans, n,
637  $ kl, ku, nrhs, imat, k,
638  $ result( k )
639  nfail = nfail + 1
640  END IF
641  60 CONTINUE
642  nrun = nrun + 5
643  70 CONTINUE
644  80 CONTINUE
645 *
646 *+ TEST 7:
647 * Get an estimate of RCOND = 1/CNDNUM.
648 *
649  90 CONTINUE
650  DO 100 itran = 1, 2
651  IF( itran.EQ.1 ) THEN
652  anorm = anormo
653  rcondc = rcondo
654  norm = 'O'
655  ELSE
656  anorm = anormi
657  rcondc = rcondi
658  norm = 'I'
659  END IF
660  srnamt = 'ZGBCON'
661  CALL zgbcon( norm, n, kl, ku, afac, ldafac,
662  $ iwork, anorm, rcond, work,
663  $ rwork, info )
664 *
665 * Check error code from ZGBCON.
666 *
667  IF( info.NE.0 )
668  $ CALL alaerh( path, 'ZGBCON', info, 0,
669  $ norm, n, n, kl, ku, -1, imat,
670  $ nfail, nerrs, nout )
671 *
672  result( 7 ) = dget06( rcond, rcondc )
673 *
674 * Print information about the tests that did
675 * not pass the threshold.
676 *
677  IF( result( 7 ).GE.thresh ) THEN
678  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
679  $ CALL alahd( nout, path )
680  WRITE( nout, fmt = 9995 )norm, n, kl, ku,
681  $ imat, 7, result( 7 )
682  nfail = nfail + 1
683  END IF
684  nrun = nrun + 1
685  100 CONTINUE
686  110 CONTINUE
687  120 CONTINUE
688  130 CONTINUE
689  140 CONTINUE
690  150 CONTINUE
691  160 CONTINUE
692 *
693 * Print a summary of the results.
694 *
695  CALL alasum( path, nout, nfail, nrun, nerrs )
696 *
697  9999 FORMAT( ' *** In ZCHKGB, LA=', i5, ' is too small for M=', i5,
698  $ ', N=', i5, ', KL=', i4, ', KU=', i4,
699  $ / ' ==> Increase LA to at least ', i5 )
700  9998 FORMAT( ' *** In ZCHKGB, LAFAC=', i5, ' is too small for M=', i5,
701  $ ', N=', i5, ', KL=', i4, ', KU=', i4,
702  $ / ' ==> Increase LAFAC to at least ', i5 )
703  9997 FORMAT( ' M =', i5, ', N =', i5, ', KL=', i5, ', KU=', i5,
704  $ ', NB =', i4, ', type ', i1, ', test(', i1, ')=', g12.5 )
705  9996 FORMAT( ' TRANS=''', a1, ''', N=', i5, ', KL=', i5, ', KU=', i5,
706  $ ', NRHS=', i3, ', type ', i1, ', test(', i1, ')=', g12.5 )
707  9995 FORMAT( ' NORM =''', a1, ''', N=', i5, ', KL=', i5, ', KU=', i5,
708  $ ',', 10x, ' type ', i1, ', test(', i1, ')=', g12.5 )
709 *
710  RETURN
711 *
712 * End of ZCHKGB
713 *
714  END
zgbtrf
subroutine zgbtrf(M, N, KL, KU, AB, LDAB, IPIV, INFO)
ZGBTRF
Definition: zgbtrf.f:146
zlarhs
subroutine zlarhs(PATH, XTYPE, UPLO, TRANS, M, N, KL, KU, NRHS, A, LDA, X, LDX, B, LDB, ISEED, INFO)
ZLARHS
Definition: zlarhs.f:211
alahd
subroutine alahd(IOUNIT, PATH)
ALAHD
Definition: alahd.f:109
zcopy
subroutine zcopy(N, ZX, INCX, ZY, INCY)
ZCOPY
Definition: zcopy.f:83
zgbt01
subroutine zgbt01(M, N, KL, KU, A, LDA, AFAC, LDAFAC, IPIV, WORK, RESID)
ZGBT01
Definition: zgbt01.f:128
zgbcon
subroutine zgbcon(NORM, N, KL, KU, AB, LDAB, IPIV, ANORM, RCOND, WORK, RWORK, INFO)
ZGBCON
Definition: zgbcon.f:149
zgbt02
subroutine zgbt02(TRANS, M, N, KL, KU, NRHS, A, LDA, X, LDX, B, LDB, RESID)
ZGBT02
Definition: zgbt02.f:141
zlaset
subroutine zlaset(UPLO, M, N, ALPHA, BETA, A, LDA)
ZLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Definition: zlaset.f:108
zget04
subroutine zget04(N, NRHS, X, LDX, XACT, LDXACT, RCOND, RESID)
ZGET04
Definition: zget04.f:104
zlacpy
subroutine zlacpy(UPLO, M, N, A, LDA, B, LDB)
ZLACPY copies all or part of one two-dimensional array to another.
Definition: zlacpy.f:105
alaerh
subroutine alaerh(PATH, SUBNAM, INFO, INFOE, OPTS, M, N, KL, KU, N5, IMAT, NFAIL, NERRS, NOUT)
ALAERH
Definition: alaerh.f:149
zchkgb
subroutine zchkgb(DOTYPE, NM, MVAL, NN, NVAL, NNB, NBVAL, NNS, NSVAL, THRESH, TSTERR, A, LA, AFAC, LAFAC, B, X, XACT, WORK, RWORK, IWORK, NOUT)
ZCHKGB
Definition: zchkgb.f:193
zgbrfs
subroutine zgbrfs(TRANS, N, KL, KU, NRHS, AB, LDAB, AFB, LDAFB, IPIV, B, LDB, X, LDX, FERR, BERR, WORK, RWORK, INFO)
ZGBRFS
Definition: zgbrfs.f:208
zgbt05
subroutine zgbt05(TRANS, N, KL, KU, NRHS, AB, LDAB, B, LDB, X, LDX, XACT, LDXACT, FERR, BERR, RESLTS)
ZGBT05
Definition: zgbt05.f:178
alasum
subroutine alasum(TYPE, NOUT, NFAIL, NRUN, NERRS)
ALASUM
Definition: alasum.f:75
zlatb4
subroutine zlatb4(PATH, IMAT, M, N, TYPE, KL, KU, ANORM, MODE, CNDNUM, DIST)
ZLATB4
Definition: zlatb4.f:123
zgbtrs
subroutine zgbtrs(TRANS, N, KL, KU, NRHS, AB, LDAB, IPIV, B, LDB, INFO)
ZGBTRS
Definition: zgbtrs.f:140
zerrge
subroutine zerrge(PATH, NUNIT)
ZERRGE
Definition: zerrge.f:57
xlaenv
subroutine xlaenv(ISPEC, NVALUE)
XLAENV
Definition: xlaenv.f:83
zlatms
subroutine zlatms(M, N, DIST, ISEED, SYM, D, MODE, COND, DMAX, KL, KU, PACK, A, LDA, WORK, INFO)
ZLATMS
Definition: zlatms.f:334