LAPACK 3.12.1
LAPACK: Linear Algebra PACKage
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◆ zchkgt()

subroutine zchkgt ( logical, dimension( * ) dotype,
integer nn,
integer, dimension( * ) nval,
integer nns,
integer, dimension( * ) nsval,
double precision thresh,
logical tsterr,
complex*16, dimension( * ) a,
complex*16, dimension( * ) af,
complex*16, dimension( * ) b,
complex*16, dimension( * ) x,
complex*16, dimension( * ) xact,
complex*16, dimension( * ) work,
double precision, dimension( * ) rwork,
integer, dimension( * ) iwork,
integer nout )

ZCHKGT

Purpose:
!>
!> ZCHKGT tests ZGTTRF, -TRS, -RFS, and -CON
!>
Parameters
[in]DOTYPE
!>          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.
!>
[in]NN
!>          NN is INTEGER
!>          The number of values of N contained in the vector NVAL.
!>
[in]NVAL
!>          NVAL is INTEGER array, dimension (NN)
!>          The values of the matrix dimension N.
!>
[in]NNS
!>          NNS is INTEGER
!>          The number of values of NRHS contained in the vector NSVAL.
!>
[in]NSVAL
!>          NSVAL is INTEGER array, dimension (NNS)
!>          The values of the number of right hand sides NRHS.
!>
[in]THRESH
!>          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.
!>
[in]TSTERR
!>          TSTERR is LOGICAL
!>          Flag that indicates whether error exits are to be tested.
!>
[out]A
!>          A is COMPLEX*16 array, dimension (NMAX*4)
!>
[out]AF
!>          AF is COMPLEX*16 array, dimension (NMAX*4)
!>
[out]B
!>          B is COMPLEX*16 array, dimension (NMAX*NSMAX)
!>          where NSMAX is the largest entry in NSVAL.
!>
[out]X
!>          X is COMPLEX*16 array, dimension (NMAX*NSMAX)
!>
[out]XACT
!>          XACT is COMPLEX*16 array, dimension (NMAX*NSMAX)
!>
[out]WORK
!>          WORK is COMPLEX*16 array, dimension
!>                      (NMAX*max(3,NSMAX))
!>
[out]RWORK
!>          RWORK is DOUBLE PRECISION array, dimension
!>                      (max(NMAX)+2*NSMAX)
!>
[out]IWORK
!>          IWORK is INTEGER array, dimension (NMAX)
!>
[in]NOUT
!>          NOUT is INTEGER
!>          The unit number for output.
!>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.

Definition at line 145 of file zchkgt.f.

147*
148* -- LAPACK test routine --
149* -- LAPACK is a software package provided by Univ. of Tennessee, --
150* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
151*
152* .. Scalar Arguments ..
153 LOGICAL TSTERR
154 INTEGER NN, NNS, NOUT
155 DOUBLE PRECISION THRESH
156* ..
157* .. Array Arguments ..
158 LOGICAL DOTYPE( * )
159 INTEGER IWORK( * ), NSVAL( * ), NVAL( * )
160 DOUBLE PRECISION RWORK( * )
161 COMPLEX*16 A( * ), AF( * ), B( * ), WORK( * ), X( * ),
162 $ XACT( * )
163* ..
164*
165* =====================================================================
166*
167* .. Parameters ..
168 DOUBLE PRECISION ONE, ZERO
169 parameter( one = 1.0d+0, zero = 0.0d+0 )
170 INTEGER NTYPES
171 parameter( ntypes = 12 )
172 INTEGER NTESTS
173 parameter( ntests = 7 )
174* ..
175* .. Local Scalars ..
176 LOGICAL TRFCON, ZEROT
177 CHARACTER DIST, NORM, TRANS, TYPE
178 CHARACTER*3 PATH
179 INTEGER I, IMAT, IN, INFO, IRHS, ITRAN, IX, IZERO, J,
180 $ K, KL, KOFF, KU, LDA, M, MODE, N, NERRS, NFAIL,
181 $ NIMAT, NRHS, NRUN
182 DOUBLE PRECISION AINVNM, ANORM, COND, RCOND, RCONDC, RCONDI,
183 $ RCONDO
184* ..
185* .. Local Arrays ..
186 CHARACTER TRANSS( 3 )
187 INTEGER ISEED( 4 ), ISEEDY( 4 )
188 DOUBLE PRECISION RESULT( NTESTS )
189 COMPLEX*16 Z( 3 )
190* ..
191* .. External Functions ..
192 DOUBLE PRECISION DGET06, DZASUM, ZLANGT
193 EXTERNAL dget06, dzasum, zlangt
194* ..
195* .. External Subroutines ..
196 EXTERNAL alaerh, alahd, alasum, zcopy, zdscal, zerrge,
197 $ zget04, zgtcon, zgtrfs, zgtt01, zgtt02, zgtt05,
198 $ zgttrf, zgttrs, zlacpy, zlagtm, zlarnv, zlatb4,
199 $ zlatms
200* ..
201* .. Intrinsic Functions ..
202 INTRINSIC max
203* ..
204* .. Scalars in Common ..
205 LOGICAL LERR, OK
206 CHARACTER*32 SRNAMT
207 INTEGER INFOT, NUNIT
208* ..
209* .. Common blocks ..
210 COMMON / infoc / infot, nunit, ok, lerr
211 COMMON / srnamc / srnamt
212* ..
213* .. Data statements ..
214 DATA iseedy / 0, 0, 0, 1 / , transs / 'N', 'T',
215 $ 'C' /
216* ..
217* .. Executable Statements ..
218*
219 path( 1: 1 ) = 'Zomplex precision'
220 path( 2: 3 ) = 'GT'
221 nrun = 0
222 nfail = 0
223 nerrs = 0
224 DO 10 i = 1, 4
225 iseed( i ) = iseedy( i )
226 10 CONTINUE
227*
228* Test the error exits
229*
230 IF( tsterr )
231 $ CALL zerrge( path, nout )
232 infot = 0
233*
234 DO 110 in = 1, nn
235*
236* Do for each value of N in NVAL.
237*
238 n = nval( in )
239 m = max( n-1, 0 )
240 lda = max( 1, n )
241 nimat = ntypes
242 IF( n.LE.0 )
243 $ nimat = 1
244*
245 DO 100 imat = 1, nimat
246*
247* Do the tests only if DOTYPE( IMAT ) is true.
248*
249 IF( .NOT.dotype( imat ) )
250 $ GO TO 100
251*
252* Set up parameters with ZLATB4.
253*
254 CALL zlatb4( path, imat, n, n, TYPE, KL, KU, ANORM, MODE,
255 $ COND, DIST )
256*
257 zerot = imat.GE.8 .AND. imat.LE.10
258 IF( imat.LE.6 ) THEN
259*
260* Types 1-6: generate matrices of known condition number.
261*
262 koff = max( 2-ku, 3-max( 1, n ) )
263 srnamt = 'ZLATMS'
264 CALL zlatms( n, n, dist, iseed, TYPE, RWORK, MODE, COND,
265 $ ANORM, KL, KU, 'Z', AF( KOFF ), 3, WORK,
266 $ INFO )
267*
268* Check the error code from ZLATMS.
269*
270 IF( info.NE.0 ) THEN
271 CALL alaerh( path, 'ZLATMS', info, 0, ' ', n, n, kl,
272 $ ku, -1, imat, nfail, nerrs, nout )
273 GO TO 100
274 END IF
275 izero = 0
276*
277 IF( n.GT.1 ) THEN
278 CALL zcopy( n-1, af( 4 ), 3, a, 1 )
279 CALL zcopy( n-1, af( 3 ), 3, a( n+m+1 ), 1 )
280 END IF
281 CALL zcopy( n, af( 2 ), 3, a( m+1 ), 1 )
282 ELSE
283*
284* Types 7-12: generate tridiagonal matrices with
285* unknown condition numbers.
286*
287 IF( .NOT.zerot .OR. .NOT.dotype( 7 ) ) THEN
288*
289* Generate a matrix with elements whose real and
290* imaginary parts are from [-1,1].
291*
292 CALL zlarnv( 2, iseed, n+2*m, a )
293 IF( anorm.NE.one )
294 $ CALL zdscal( n+2*m, anorm, a, 1 )
295 ELSE IF( izero.GT.0 ) THEN
296*
297* Reuse the last matrix by copying back the zeroed out
298* elements.
299*
300 IF( izero.EQ.1 ) THEN
301 a( n ) = z( 2 )
302 IF( n.GT.1 )
303 $ a( 1 ) = z( 3 )
304 ELSE IF( izero.EQ.n ) THEN
305 a( 3*n-2 ) = z( 1 )
306 a( 2*n-1 ) = z( 2 )
307 ELSE
308 a( 2*n-2+izero ) = z( 1 )
309 a( n-1+izero ) = z( 2 )
310 a( izero ) = z( 3 )
311 END IF
312 END IF
313*
314* If IMAT > 7, set one column of the matrix to 0.
315*
316 IF( .NOT.zerot ) THEN
317 izero = 0
318 ELSE IF( imat.EQ.8 ) THEN
319 izero = 1
320 z( 2 ) = a( n )
321 a( n ) = zero
322 IF( n.GT.1 ) THEN
323 z( 3 ) = a( 1 )
324 a( 1 ) = zero
325 END IF
326 ELSE IF( imat.EQ.9 ) THEN
327 izero = n
328 z( 1 ) = a( 3*n-2 )
329 z( 2 ) = a( 2*n-1 )
330 a( 3*n-2 ) = zero
331 a( 2*n-1 ) = zero
332 ELSE
333 izero = ( n+1 ) / 2
334 DO 20 i = izero, n - 1
335 a( 2*n-2+i ) = zero
336 a( n-1+i ) = zero
337 a( i ) = zero
338 20 CONTINUE
339 a( 3*n-2 ) = zero
340 a( 2*n-1 ) = zero
341 END IF
342 END IF
343*
344*+ TEST 1
345* Factor A as L*U and compute the ratio
346* norm(L*U - A) / (n * norm(A) * EPS )
347*
348 CALL zcopy( n+2*m, a, 1, af, 1 )
349 srnamt = 'ZGTTRF'
350 CALL zgttrf( n, af, af( m+1 ), af( n+m+1 ), af( n+2*m+1 ),
351 $ iwork, info )
352*
353* Check error code from ZGTTRF.
354*
355 IF( info.NE.izero )
356 $ CALL alaerh( path, 'ZGTTRF', info, izero, ' ', n, n, 1,
357 $ 1, -1, imat, nfail, nerrs, nout )
358 trfcon = info.NE.0
359*
360 CALL zgtt01( n, a, a( m+1 ), a( n+m+1 ), af, af( m+1 ),
361 $ af( n+m+1 ), af( n+2*m+1 ), iwork, work, lda,
362 $ rwork, result( 1 ) )
363*
364* Print the test ratio if it is .GE. THRESH.
365*
366 IF( result( 1 ).GE.thresh ) THEN
367 IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
368 $ CALL alahd( nout, path )
369 WRITE( nout, fmt = 9999 )n, imat, 1, result( 1 )
370 nfail = nfail + 1
371 END IF
372 nrun = nrun + 1
373*
374 DO 50 itran = 1, 2
375 trans = transs( itran )
376 IF( itran.EQ.1 ) THEN
377 norm = 'O'
378 ELSE
379 norm = 'I'
380 END IF
381 anorm = zlangt( norm, n, a, a( m+1 ), a( n+m+1 ) )
382*
383 IF( .NOT.trfcon ) THEN
384*
385* Use ZGTTRS to solve for one column at a time of
386* inv(A), computing the maximum column sum as we go.
387*
388 ainvnm = zero
389 DO 40 i = 1, n
390 DO 30 j = 1, n
391 x( j ) = zero
392 30 CONTINUE
393 x( i ) = one
394 CALL zgttrs( trans, n, 1, af, af( m+1 ),
395 $ af( n+m+1 ), af( n+2*m+1 ), iwork, x,
396 $ lda, info )
397 ainvnm = max( ainvnm, dzasum( n, x, 1 ) )
398 40 CONTINUE
399*
400* Compute RCONDC = 1 / (norm(A) * norm(inv(A))
401*
402 IF( anorm.LE.zero .OR. ainvnm.LE.zero ) THEN
403 rcondc = one
404 ELSE
405 rcondc = ( one / anorm ) / ainvnm
406 END IF
407 IF( itran.EQ.1 ) THEN
408 rcondo = rcondc
409 ELSE
410 rcondi = rcondc
411 END IF
412 ELSE
413 rcondc = zero
414 END IF
415*
416*+ TEST 7
417* Estimate the reciprocal of the condition number of the
418* matrix.
419*
420 srnamt = 'ZGTCON'
421 CALL zgtcon( norm, n, af, af( m+1 ), af( n+m+1 ),
422 $ af( n+2*m+1 ), iwork, anorm, rcond, work,
423 $ info )
424*
425* Check error code from ZGTCON.
426*
427 IF( info.NE.0 )
428 $ CALL alaerh( path, 'ZGTCON', info, 0, norm, n, n, -1,
429 $ -1, -1, imat, nfail, nerrs, nout )
430*
431 result( 7 ) = dget06( rcond, rcondc )
432*
433* Print the test ratio if it is .GE. THRESH.
434*
435 IF( result( 7 ).GE.thresh ) THEN
436 IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
437 $ CALL alahd( nout, path )
438 WRITE( nout, fmt = 9997 )norm, n, imat, 7,
439 $ result( 7 )
440 nfail = nfail + 1
441 END IF
442 nrun = nrun + 1
443 50 CONTINUE
444*
445* Skip the remaining tests if the matrix is singular.
446*
447 IF( trfcon )
448 $ GO TO 100
449*
450 DO 90 irhs = 1, nns
451 nrhs = nsval( irhs )
452*
453* Generate NRHS random solution vectors.
454*
455 ix = 1
456 DO 60 j = 1, nrhs
457 CALL zlarnv( 2, iseed, n, xact( ix ) )
458 ix = ix + lda
459 60 CONTINUE
460*
461 DO 80 itran = 1, 3
462 trans = transs( itran )
463 IF( itran.EQ.1 ) THEN
464 rcondc = rcondo
465 ELSE
466 rcondc = rcondi
467 END IF
468*
469* Set the right hand side.
470*
471 CALL zlagtm( trans, n, nrhs, one, a, a( m+1 ),
472 $ a( n+m+1 ), xact, lda, zero, b, lda )
473*
474*+ TEST 2
475* Solve op(A) * X = B and compute the residual.
476*
477 CALL zlacpy( 'Full', n, nrhs, b, lda, x, lda )
478 srnamt = 'ZGTTRS'
479 CALL zgttrs( trans, n, nrhs, af, af( m+1 ),
480 $ af( n+m+1 ), af( n+2*m+1 ), iwork, x,
481 $ lda, info )
482*
483* Check error code from ZGTTRS.
484*
485 IF( info.NE.0 )
486 $ CALL alaerh( path, 'ZGTTRS', info, 0, trans, n, n,
487 $ -1, -1, nrhs, imat, nfail, nerrs,
488 $ nout )
489*
490 CALL zlacpy( 'Full', n, nrhs, b, lda, work, lda )
491 CALL zgtt02( trans, n, nrhs, a, a( m+1 ), a( n+m+1 ),
492 $ x, lda, work, lda, result( 2 ) )
493*
494*+ TEST 3
495* Check solution from generated exact solution.
496*
497 CALL zget04( n, nrhs, x, lda, xact, lda, rcondc,
498 $ result( 3 ) )
499*
500*+ TESTS 4, 5, and 6
501* Use iterative refinement to improve the solution.
502*
503 srnamt = 'ZGTRFS'
504 CALL zgtrfs( trans, n, nrhs, a, a( m+1 ), a( n+m+1 ),
505 $ af, af( m+1 ), af( n+m+1 ),
506 $ af( n+2*m+1 ), iwork, b, lda, x, lda,
507 $ rwork, rwork( nrhs+1 ), work,
508 $ rwork( 2*nrhs+1 ), info )
509*
510* Check error code from ZGTRFS.
511*
512 IF( info.NE.0 )
513 $ CALL alaerh( path, 'ZGTRFS', info, 0, trans, n, n,
514 $ -1, -1, nrhs, imat, nfail, nerrs,
515 $ nout )
516*
517 CALL zget04( n, nrhs, x, lda, xact, lda, rcondc,
518 $ result( 4 ) )
519 CALL zgtt05( trans, n, nrhs, a, a( m+1 ), a( n+m+1 ),
520 $ b, lda, x, lda, xact, lda, rwork,
521 $ rwork( nrhs+1 ), result( 5 ) )
522*
523* Print information about the tests that did not pass the
524* threshold.
525*
526 DO 70 k = 2, 6
527 IF( result( k ).GE.thresh ) THEN
528 IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
529 $ CALL alahd( nout, path )
530 WRITE( nout, fmt = 9998 )trans, n, nrhs, imat,
531 $ k, result( k )
532 nfail = nfail + 1
533 END IF
534 70 CONTINUE
535 nrun = nrun + 5
536 80 CONTINUE
537 90 CONTINUE
538 100 CONTINUE
539 110 CONTINUE
540*
541* Print a summary of the results.
542*
543 CALL alasum( path, nout, nfail, nrun, nerrs )
544*
545 9999 FORMAT( 12x, 'N =', i5, ',', 10x, ' type ', i2, ', test(', i2,
546 $ ') = ', g12.5 )
547 9998 FORMAT( ' TRANS=''', a1, ''', N =', i5, ', NRHS=', i3, ', type ',
548 $ i2, ', test(', i2, ') = ', g12.5 )
549 9997 FORMAT( ' NORM =''', a1, ''', N =', i5, ',', 10x, ' type ', i2,
550 $ ', test(', i2, ') = ', g12.5 )
551 RETURN
552*
553* End of ZCHKGT
554*
alasum
subroutine alasum(type, nout, nfail, nrun, nerrs)
ALASUM
Definition alasum.f:73
alaerh
subroutine alaerh(path, subnam, info, infoe, opts, m, n, kl, ku, n5, imat, nfail, nerrs, nout)
ALAERH
Definition alaerh.f:147
alahd
subroutine alahd(iounit, path)
ALAHD
Definition alahd.f:107
dget06
double precision function dget06(rcond, rcondc)
DGET06
Definition dget06.f:55
dzasum
double precision function dzasum(n, zx, incx)
DZASUM
Definition dzasum.f:72
zcopy
subroutine zcopy(n, zx, incx, zy, incy)
ZCOPY
Definition zcopy.f:81
zgtcon
subroutine zgtcon(norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, info)
ZGTCON
Definition zgtcon.f:139
zgtrfs
subroutine zgtrfs(trans, n, nrhs, dl, d, du, dlf, df, duf, du2, ipiv, b, ldb, x, ldx, ferr, berr, work, rwork, info)
ZGTRFS
Definition zgtrfs.f:209
zgttrf
subroutine zgttrf(n, dl, d, du, du2, ipiv, info)
ZGTTRF
Definition zgttrf.f:122
zgttrs
subroutine zgttrs(trans, n, nrhs, dl, d, du, du2, ipiv, b, ldb, info)
ZGTTRS
Definition zgttrs.f:137
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:101
zlagtm
subroutine zlagtm(trans, n, nrhs, alpha, dl, d, du, x, ldx, beta, b, ldb)
ZLAGTM performs a matrix-matrix product of the form C = αAB+βC, where A is a tridiagonal matrix,...
Definition zlagtm.f:144
zlangt
double precision function zlangt(norm, n, dl, d, du)
ZLANGT returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value ...
Definition zlangt.f:104
zlarnv
subroutine zlarnv(idist, iseed, n, x)
ZLARNV returns a vector of random numbers from a uniform or normal distribution.
Definition zlarnv.f:97
zdscal
subroutine zdscal(n, da, zx, incx)
ZDSCAL
Definition zdscal.f:78
zerrge
subroutine zerrge(path, nunit)
ZERRGE
Definition zerrge.f:55
zget04
subroutine zget04(n, nrhs, x, ldx, xact, ldxact, rcond, resid)
ZGET04
Definition zget04.f:102
zgtt01
subroutine zgtt01(n, dl, d, du, dlf, df, duf, du2, ipiv, work, ldwork, rwork, resid)
ZGTT01
Definition zgtt01.f:134
zgtt02
subroutine zgtt02(trans, n, nrhs, dl, d, du, x, ldx, b, ldb, resid)
ZGTT02
Definition zgtt02.f:124
zgtt05
subroutine zgtt05(trans, n, nrhs, dl, d, du, b, ldb, x, ldx, xact, ldxact, ferr, berr, reslts)
ZGTT05
Definition zgtt05.f:165
zlatb4
subroutine zlatb4(path, imat, m, n, type, kl, ku, anorm, mode, cndnum, dist)
ZLATB4
Definition zlatb4.f:121
zlatms
subroutine zlatms(m, n, dist, iseed, sym, d, mode, cond, dmax, kl, ku, pack, a, lda, work, info)
ZLATMS
Definition zlatms.f:332
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