LAPACK  3.8.0
LAPACK: Linear Algebra PACKage

◆ ddrvsy()

subroutine ddrvsy ( logical, dimension( * )  DOTYPE,
integer  NN,
integer, dimension( * )  NVAL,
integer  NRHS,
double precision  THRESH,
logical  TSTERR,
integer  NMAX,
double precision, dimension( * )  A,
double precision, dimension( * )  AFAC,
double precision, dimension( * )  AINV,
double precision, dimension( * )  B,
double precision, dimension( * )  X,
double precision, dimension( * )  XACT,
double precision, dimension( * )  WORK,
double precision, dimension( * )  RWORK,
integer, dimension( * )  IWORK,
integer  NOUT 
)

DDRVSY

DDRVSYX

Purpose:
 DDRVSY tests the driver routines DSYSV and -SVX.
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]NRHS
          NRHS is INTEGER
          The number of right hand side vectors to be generated for
          each linear system.
[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.
[in]NMAX
          NMAX is INTEGER
          The maximum value permitted for N, used in dimensioning the
          work arrays.
[out]A
          A is DOUBLE PRECISION array, dimension (NMAX*NMAX)
[out]AFAC
          AFAC is DOUBLE PRECISION array, dimension (NMAX*NMAX)
[out]AINV
          AINV is DOUBLE PRECISION array, dimension (NMAX*NMAX)
[out]B
          B is DOUBLE PRECISION array, dimension (NMAX*NRHS)
[out]X
          X is DOUBLE PRECISION array, dimension (NMAX*NRHS)
[out]XACT
          XACT is DOUBLE PRECISION array, dimension (NMAX*NRHS)
[out]WORK
          WORK is DOUBLE PRECISION array, dimension (NMAX*max(2,NRHS))
[out]RWORK
          RWORK is DOUBLE PRECISION array, dimension (NMAX+2*NRHS)
[out]IWORK
          IWORK is INTEGER array, dimension (2*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.
Date
November 2013
Purpose:
 DDRVSY tests the driver routines DSYSV, -SVX, and -SVXX.

 Note that this file is used only when the XBLAS are available,
 otherwise ddrvsy.f defines this subroutine.
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]NRHS
          NRHS is INTEGER
          The number of right hand side vectors to be generated for
          each linear system.
[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.
[in]NMAX
          NMAX is INTEGER
          The maximum value permitted for N, used in dimensioning the
          work arrays.
[out]A
          A is DOUBLE PRECISION array, dimension (NMAX*NMAX)
[out]AFAC
          AFAC is DOUBLE PRECISION array, dimension (NMAX*NMAX)
[out]AINV
          AINV is DOUBLE PRECISION array, dimension (NMAX*NMAX)
[out]B
          B is DOUBLE PRECISION array, dimension (NMAX*NRHS)
[out]X
          X is DOUBLE PRECISION array, dimension (NMAX*NRHS)
[out]XACT
          XACT is DOUBLE PRECISION array, dimension (NMAX*NRHS)
[out]WORK
          WORK is DOUBLE PRECISION array, dimension
                      (NMAX*max(2,NRHS))
[out]RWORK
          RWORK is DOUBLE PRECISION array, dimension (NMAX+2*NRHS)
[out]IWORK
          IWORK is INTEGER array, dimension (2*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.
Date
December 2016

Definition at line 154 of file ddrvsy.f.

154 *
155 * -- LAPACK test routine (version 3.5.0) --
156 * -- LAPACK is a software package provided by Univ. of Tennessee, --
157 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
158 * November 2013
159 *
160 * .. Scalar Arguments ..
161  LOGICAL tsterr
162  INTEGER nmax, nn, nout, nrhs
163  DOUBLE PRECISION thresh
164 * ..
165 * .. Array Arguments ..
166  LOGICAL dotype( * )
167  INTEGER iwork( * ), nval( * )
168  DOUBLE PRECISION a( * ), afac( * ), ainv( * ), b( * ),
169  $ rwork( * ), work( * ), x( * ), xact( * )
170 * ..
171 *
172 * =====================================================================
173 *
174 * .. Parameters ..
175  DOUBLE PRECISION one, zero
176  parameter( one = 1.0d+0, zero = 0.0d+0 )
177  INTEGER ntypes, ntests
178  parameter( ntypes = 10, ntests = 6 )
179  INTEGER nfact
180  parameter( nfact = 2 )
181 * ..
182 * .. Local Scalars ..
183  LOGICAL zerot
184  CHARACTER dist, fact, TYPE, uplo, xtype
185  CHARACTER*3 path
186  INTEGER i, i1, i2, ifact, imat, in, info, ioff, iuplo,
187  $ izero, j, k, k1, kl, ku, lda, lwork, mode, n,
188  $ nb, nbmin, nerrs, nfail, nimat, nrun, nt
189  DOUBLE PRECISION ainvnm, anorm, cndnum, rcond, rcondc
190 * ..
191 * .. Local Arrays ..
192  CHARACTER facts( nfact ), uplos( 2 )
193  INTEGER iseed( 4 ), iseedy( 4 )
194  DOUBLE PRECISION result( ntests )
195 * ..
196 * .. External Functions ..
197  DOUBLE PRECISION dget06, dlansy
198  EXTERNAL dget06, dlansy
199 * ..
200 * .. External Subroutines ..
201  EXTERNAL aladhd, alaerh, alasvm, derrvx, dget04, dlacpy,
204 * ..
205 * .. Scalars in Common ..
206  LOGICAL lerr, ok
207  CHARACTER*32 srnamt
208  INTEGER infot, nunit
209 * ..
210 * .. Common blocks ..
211  COMMON / infoc / infot, nunit, ok, lerr
212  COMMON / srnamc / srnamt
213 * ..
214 * .. Intrinsic Functions ..
215  INTRINSIC max, min
216 * ..
217 * .. Data statements ..
218  DATA iseedy / 1988, 1989, 1990, 1991 /
219  DATA uplos / 'U', 'L' / , facts / 'F', 'N' /
220 * ..
221 * .. Executable Statements ..
222 *
223 * Initialize constants and the random number seed.
224 *
225  path( 1: 1 ) = 'Double precision'
226  path( 2: 3 ) = 'SY'
227  nrun = 0
228  nfail = 0
229  nerrs = 0
230  DO 10 i = 1, 4
231  iseed( i ) = iseedy( i )
232  10 CONTINUE
233  lwork = max( 2*nmax, nmax*nrhs )
234 *
235 * Test the error exits
236 *
237  IF( tsterr )
238  $ CALL derrvx( path, nout )
239  infot = 0
240 *
241 * Set the block size and minimum block size for testing.
242 *
243  nb = 1
244  nbmin = 2
245  CALL xlaenv( 1, nb )
246  CALL xlaenv( 2, nbmin )
247 *
248 * Do for each value of N in NVAL
249 *
250  DO 180 in = 1, nn
251  n = nval( in )
252  lda = max( n, 1 )
253  xtype = 'N'
254  nimat = ntypes
255  IF( n.LE.0 )
256  $ nimat = 1
257 *
258  DO 170 imat = 1, nimat
259 *
260 * Do the tests only if DOTYPE( IMAT ) is true.
261 *
262  IF( .NOT.dotype( imat ) )
263  $ GO TO 170
264 *
265 * Skip types 3, 4, 5, or 6 if the matrix size is too small.
266 *
267  zerot = imat.GE.3 .AND. imat.LE.6
268  IF( zerot .AND. n.LT.imat-2 )
269  $ GO TO 170
270 *
271 * Do first for UPLO = 'U', then for UPLO = 'L'
272 *
273  DO 160 iuplo = 1, 2
274  uplo = uplos( iuplo )
275 *
276 * Set up parameters with DLATB4 and generate a test matrix
277 * with DLATMS.
278 *
279  CALL dlatb4( path, imat, n, n, TYPE, kl, ku, anorm, mode,
280  $ cndnum, dist )
281 *
282  srnamt = 'DLATMS'
283  CALL dlatms( n, n, dist, iseed, TYPE, rwork, mode,
284  $ cndnum, anorm, kl, ku, uplo, a, lda, work,
285  $ info )
286 *
287 * Check error code from DLATMS.
288 *
289  IF( info.NE.0 ) THEN
290  CALL alaerh( path, 'DLATMS', info, 0, uplo, n, n, -1,
291  $ -1, -1, imat, nfail, nerrs, nout )
292  GO TO 160
293  END IF
294 *
295 * For types 3-6, zero one or more rows and columns of the
296 * matrix to test that INFO is returned correctly.
297 *
298  IF( zerot ) THEN
299  IF( imat.EQ.3 ) THEN
300  izero = 1
301  ELSE IF( imat.EQ.4 ) THEN
302  izero = n
303  ELSE
304  izero = n / 2 + 1
305  END IF
306 *
307  IF( imat.LT.6 ) THEN
308 *
309 * Set row and column IZERO to zero.
310 *
311  IF( iuplo.EQ.1 ) THEN
312  ioff = ( izero-1 )*lda
313  DO 20 i = 1, izero - 1
314  a( ioff+i ) = zero
315  20 CONTINUE
316  ioff = ioff + izero
317  DO 30 i = izero, n
318  a( ioff ) = zero
319  ioff = ioff + lda
320  30 CONTINUE
321  ELSE
322  ioff = izero
323  DO 40 i = 1, izero - 1
324  a( ioff ) = zero
325  ioff = ioff + lda
326  40 CONTINUE
327  ioff = ioff - izero
328  DO 50 i = izero, n
329  a( ioff+i ) = zero
330  50 CONTINUE
331  END IF
332  ELSE
333  ioff = 0
334  IF( iuplo.EQ.1 ) THEN
335 *
336 * Set the first IZERO rows and columns to zero.
337 *
338  DO 70 j = 1, n
339  i2 = min( j, izero )
340  DO 60 i = 1, i2
341  a( ioff+i ) = zero
342  60 CONTINUE
343  ioff = ioff + lda
344  70 CONTINUE
345  ELSE
346 *
347 * Set the last IZERO rows and columns to zero.
348 *
349  DO 90 j = 1, n
350  i1 = max( j, izero )
351  DO 80 i = i1, n
352  a( ioff+i ) = zero
353  80 CONTINUE
354  ioff = ioff + lda
355  90 CONTINUE
356  END IF
357  END IF
358  ELSE
359  izero = 0
360  END IF
361 *
362  DO 150 ifact = 1, nfact
363 *
364 * Do first for FACT = 'F', then for other values.
365 *
366  fact = facts( ifact )
367 *
368 * Compute the condition number for comparison with
369 * the value returned by DSYSVX.
370 *
371  IF( zerot ) THEN
372  IF( ifact.EQ.1 )
373  $ GO TO 150
374  rcondc = zero
375 *
376  ELSE IF( ifact.EQ.1 ) THEN
377 *
378 * Compute the 1-norm of A.
379 *
380  anorm = dlansy( '1', uplo, n, a, lda, rwork )
381 *
382 * Factor the matrix A.
383 *
384  CALL dlacpy( uplo, n, n, a, lda, afac, lda )
385  CALL dsytrf( uplo, n, afac, lda, iwork, work,
386  $ lwork, info )
387 *
388 * Compute inv(A) and take its norm.
389 *
390  CALL dlacpy( uplo, n, n, afac, lda, ainv, lda )
391  lwork = (n+nb+1)*(nb+3)
392  CALL dsytri2( uplo, n, ainv, lda, iwork, work,
393  $ lwork, info )
394  ainvnm = dlansy( '1', uplo, n, ainv, lda, rwork )
395 *
396 * Compute the 1-norm condition number of A.
397 *
398  IF( anorm.LE.zero .OR. ainvnm.LE.zero ) THEN
399  rcondc = one
400  ELSE
401  rcondc = ( one / anorm ) / ainvnm
402  END IF
403  END IF
404 *
405 * Form an exact solution and set the right hand side.
406 *
407  srnamt = 'DLARHS'
408  CALL dlarhs( path, xtype, uplo, ' ', n, n, kl, ku,
409  $ nrhs, a, lda, xact, lda, b, lda, iseed,
410  $ info )
411  xtype = 'C'
412 *
413 * --- Test DSYSV ---
414 *
415  IF( ifact.EQ.2 ) THEN
416  CALL dlacpy( uplo, n, n, a, lda, afac, lda )
417  CALL dlacpy( 'Full', n, nrhs, b, lda, x, lda )
418 *
419 * Factor the matrix and solve the system using DSYSV.
420 *
421  srnamt = 'DSYSV '
422  CALL dsysv( uplo, n, nrhs, afac, lda, iwork, x,
423  $ lda, work, lwork, info )
424 *
425 * Adjust the expected value of INFO to account for
426 * pivoting.
427 *
428  k = izero
429  IF( k.GT.0 ) THEN
430  100 CONTINUE
431  IF( iwork( k ).LT.0 ) THEN
432  IF( iwork( k ).NE.-k ) THEN
433  k = -iwork( k )
434  GO TO 100
435  END IF
436  ELSE IF( iwork( k ).NE.k ) THEN
437  k = iwork( k )
438  GO TO 100
439  END IF
440  END IF
441 *
442 * Check error code from DSYSV .
443 *
444  IF( info.NE.k ) THEN
445  CALL alaerh( path, 'DSYSV ', info, k, uplo, n,
446  $ n, -1, -1, nrhs, imat, nfail,
447  $ nerrs, nout )
448  GO TO 120
449  ELSE IF( info.NE.0 ) THEN
450  GO TO 120
451  END IF
452 *
453 * Reconstruct matrix from factors and compute
454 * residual.
455 *
456  CALL dsyt01( uplo, n, a, lda, afac, lda, iwork,
457  $ ainv, lda, rwork, result( 1 ) )
458 *
459 * Compute residual of the computed solution.
460 *
461  CALL dlacpy( 'Full', n, nrhs, b, lda, work, lda )
462  CALL dpot02( uplo, n, nrhs, a, lda, x, lda, work,
463  $ lda, rwork, result( 2 ) )
464 *
465 * Check solution from generated exact solution.
466 *
467  CALL dget04( n, nrhs, x, lda, xact, lda, rcondc,
468  $ result( 3 ) )
469  nt = 3
470 *
471 * Print information about the tests that did not pass
472 * the threshold.
473 *
474  DO 110 k = 1, nt
475  IF( result( k ).GE.thresh ) THEN
476  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
477  $ CALL aladhd( nout, path )
478  WRITE( nout, fmt = 9999 )'DSYSV ', uplo, n,
479  $ imat, k, result( k )
480  nfail = nfail + 1
481  END IF
482  110 CONTINUE
483  nrun = nrun + nt
484  120 CONTINUE
485  END IF
486 *
487 * --- Test DSYSVX ---
488 *
489  IF( ifact.EQ.2 )
490  $ CALL dlaset( uplo, n, n, zero, zero, afac, lda )
491  CALL dlaset( 'Full', n, nrhs, zero, zero, x, lda )
492 *
493 * Solve the system and compute the condition number and
494 * error bounds using DSYSVX.
495 *
496  srnamt = 'DSYSVX'
497  CALL dsysvx( fact, uplo, n, nrhs, a, lda, afac, lda,
498  $ iwork, b, lda, x, lda, rcond, rwork,
499  $ rwork( nrhs+1 ), work, lwork,
500  $ iwork( n+1 ), info )
501 *
502 * Adjust the expected value of INFO to account for
503 * pivoting.
504 *
505  k = izero
506  IF( k.GT.0 ) THEN
507  130 CONTINUE
508  IF( iwork( k ).LT.0 ) THEN
509  IF( iwork( k ).NE.-k ) THEN
510  k = -iwork( k )
511  GO TO 130
512  END IF
513  ELSE IF( iwork( k ).NE.k ) THEN
514  k = iwork( k )
515  GO TO 130
516  END IF
517  END IF
518 *
519 * Check the error code from DSYSVX.
520 *
521  IF( info.NE.k ) THEN
522  CALL alaerh( path, 'DSYSVX', info, k, fact // uplo,
523  $ n, n, -1, -1, nrhs, imat, nfail,
524  $ nerrs, nout )
525  GO TO 150
526  END IF
527 *
528  IF( info.EQ.0 ) THEN
529  IF( ifact.GE.2 ) THEN
530 *
531 * Reconstruct matrix from factors and compute
532 * residual.
533 *
534  CALL dsyt01( uplo, n, a, lda, afac, lda, iwork,
535  $ ainv, lda, rwork( 2*nrhs+1 ),
536  $ result( 1 ) )
537  k1 = 1
538  ELSE
539  k1 = 2
540  END IF
541 *
542 * Compute residual of the computed solution.
543 *
544  CALL dlacpy( 'Full', n, nrhs, b, lda, work, lda )
545  CALL dpot02( uplo, n, nrhs, a, lda, x, lda, work,
546  $ lda, rwork( 2*nrhs+1 ), result( 2 ) )
547 *
548 * Check solution from generated exact solution.
549 *
550  CALL dget04( n, nrhs, x, lda, xact, lda, rcondc,
551  $ result( 3 ) )
552 *
553 * Check the error bounds from iterative refinement.
554 *
555  CALL dpot05( uplo, n, nrhs, a, lda, b, lda, x, lda,
556  $ xact, lda, rwork, rwork( nrhs+1 ),
557  $ result( 4 ) )
558  ELSE
559  k1 = 6
560  END IF
561 *
562 * Compare RCOND from DSYSVX with the computed value
563 * in RCONDC.
564 *
565  result( 6 ) = dget06( rcond, rcondc )
566 *
567 * Print information about the tests that did not pass
568 * the threshold.
569 *
570  DO 140 k = k1, 6
571  IF( result( k ).GE.thresh ) THEN
572  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
573  $ CALL aladhd( nout, path )
574  WRITE( nout, fmt = 9998 )'DSYSVX', fact, uplo,
575  $ n, imat, k, result( k )
576  nfail = nfail + 1
577  END IF
578  140 CONTINUE
579  nrun = nrun + 7 - k1
580 *
581  150 CONTINUE
582 *
583  160 CONTINUE
584  170 CONTINUE
585  180 CONTINUE
586 *
587 * Print a summary of the results.
588 *
589  CALL alasvm( path, nout, nfail, nrun, nerrs )
590 *
591  9999 FORMAT( 1x, a, ', UPLO=''', a1, ''', N =', i5, ', type ', i2,
592  $ ', test ', i2, ', ratio =', g12.5 )
593  9998 FORMAT( 1x, a, ', FACT=''', a1, ''', UPLO=''', a1, ''', N =', i5,
594  $ ', type ', i2, ', test ', i2, ', ratio =', g12.5 )
595  RETURN
596 *
597 * End of DDRVSY
598 *
subroutine dlacpy(UPLO, M, N, A, LDA, B, LDB)
DLACPY copies all or part of one two-dimensional array to another.
Definition: dlacpy.f:105
subroutine dlatb4(PATH, IMAT, M, N, TYPE, KL, KU, ANORM, MODE, CNDNUM, DIST)
DLATB4
Definition: dlatb4.f:122
subroutine alasvm(TYPE, NOUT, NFAIL, NRUN, NERRS)
ALASVM
Definition: alasvm.f:75
double precision function dlansy(NORM, UPLO, N, A, LDA, WORK)
DLANSY returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric matrix.
Definition: dlansy.f:124
subroutine alaerh(PATH, SUBNAM, INFO, INFOE, OPTS, M, N, KL, KU, N5, IMAT, NFAIL, NERRS, NOUT)
ALAERH
Definition: alaerh.f:149
subroutine dsytri2(UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO)
DSYTRI2
Definition: dsytri2.f:129
subroutine dsyt01(UPLO, N, A, LDA, AFAC, LDAFAC, IPIV, C, LDC, RWORK, RESID)
DSYT01
Definition: dsyt01.f:126
subroutine dlarhs(PATH, XTYPE, UPLO, TRANS, M, N, KL, KU, NRHS, A, LDA, X, LDX, B, LDB, ISEED, INFO)
DLARHS
Definition: dlarhs.f:206
subroutine dlatms(M, N, DIST, ISEED, SYM, D, MODE, COND, DMAX, KL, KU, PACK, A, LDA, WORK, INFO)
DLATMS
Definition: dlatms.f:323
subroutine dpot05(UPLO, N, NRHS, A, LDA, B, LDB, X, LDX, XACT, LDXACT, FERR, BERR, RESLTS)
DPOT05
Definition: dpot05.f:166
subroutine dsysv(UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, LWORK, INFO)
DSYSV computes the solution to system of linear equations A * X = B for SY matrices ...
Definition: dsysv.f:173
subroutine dlaset(UPLO, M, N, ALPHA, BETA, A, LDA)
DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values...
Definition: dlaset.f:112
subroutine xlaenv(ISPEC, NVALUE)
XLAENV
Definition: xlaenv.f:83
subroutine dget04(N, NRHS, X, LDX, XACT, LDXACT, RCOND, RESID)
DGET04
Definition: dget04.f:104
subroutine aladhd(IOUNIT, PATH)
ALADHD
Definition: aladhd.f:92
subroutine derrvx(PATH, NUNIT)
DERRVX
Definition: derrvx.f:57
subroutine dsytrf(UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO)
DSYTRF
Definition: dsytrf.f:184
double precision function dget06(RCOND, RCONDC)
DGET06
Definition: dget06.f:57
subroutine dsysvx(FACT, UPLO, N, NRHS, A, LDA, AF, LDAF, IPIV, B, LDB, X, LDX, RCOND, FERR, BERR, WORK, LWORK, IWORK, INFO)
DSYSVX computes the solution to system of linear equations A * X = B for SY matrices ...
Definition: dsysvx.f:286
subroutine dpot02(UPLO, N, NRHS, A, LDA, X, LDX, B, LDB, RWORK, RESID)
DPOT02
Definition: dpot02.f:129
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