LAPACK  3.8.0 LAPACK: Linear Algebra PACKage

## ◆ dchksy()

 subroutine dchksy ( logical, dimension( * ) DOTYPE, integer NN, integer, dimension( * ) NVAL, integer NNB, integer, dimension( * ) NBVAL, integer NNS, integer, dimension( * ) NSVAL, 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 )

DCHKSY

Purpose:
` DCHKSY tests DSYTRF, -TRI2, -TRS, -TRS2, -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] NNB ``` NNB is INTEGER The number of values of NB contained in the vector NBVAL.``` [in] NBVAL ``` NBVAL is INTEGER array, dimension (NBVAL) The values of the blocksize NB.``` [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.``` [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*NSMAX) where NSMAX is the largest entry in NSVAL.``` [out] X ` X is DOUBLE PRECISION array, dimension (NMAX*NSMAX)` [out] XACT ` XACT is DOUBLE PRECISION array, dimension (NMAX*NSMAX)` [out] WORK ` WORK is DOUBLE PRECISION 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 (2*NMAX)` [in] NOUT ``` NOUT is INTEGER The unit number for output.```
Date
November 2013

Definition at line 172 of file dchksy.f.

172 *
173 * -- LAPACK test routine (version 3.5.0) --
174 * -- LAPACK is a software package provided by Univ. of Tennessee, --
175 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
176 * November 2013
177 *
178 * .. Scalar Arguments ..
179  LOGICAL tsterr
180  INTEGER nmax, nn, nnb, nns, nout
181  DOUBLE PRECISION thresh
182 * ..
183 * .. Array Arguments ..
184  LOGICAL dotype( * )
185  INTEGER iwork( * ), nbval( * ), nsval( * ), nval( * )
186  DOUBLE PRECISION a( * ), afac( * ), ainv( * ), b( * ),
187  \$ rwork( * ), work( * ), x( * ), xact( * )
188 * ..
189 *
190 * =====================================================================
191 *
192 * .. Parameters ..
193  DOUBLE PRECISION zero
194  parameter( zero = 0.0d+0 )
195  INTEGER ntypes
196  parameter( ntypes = 10 )
197  INTEGER ntests
198  parameter( ntests = 9 )
199 * ..
200 * .. Local Scalars ..
201  LOGICAL trfcon, zerot
202  CHARACTER dist, TYPE, uplo, xtype
203  CHARACTER*3 path
204  INTEGER i, i1, i2, imat, in, inb, info, ioff, irhs,
205  \$ iuplo, izero, j, k, kl, ku, lda, lwork, mode,
206  \$ n, nb, nerrs, nfail, nimat, nrhs, nrun, nt
207  DOUBLE PRECISION anorm, cndnum, rcond, rcondc
208 * ..
209 * .. Local Arrays ..
210  CHARACTER uplos( 2 )
211  INTEGER iseed( 4 ), iseedy( 4 )
212  DOUBLE PRECISION result( ntests )
213 * ..
214 * .. External Functions ..
215  DOUBLE PRECISION dget06, dlansy
216  EXTERNAL dget06, dlansy
217 * ..
218 * .. External Subroutines ..
219  EXTERNAL alaerh, alahd, alasum, derrsy, dget04, dlacpy,
221  \$ dsycon, dsyrfs, dsyt01, dsytrf,
223 * ..
224 * .. Intrinsic Functions ..
225  INTRINSIC max, min
226 * ..
227 * .. Scalars in Common ..
228  LOGICAL lerr, ok
229  CHARACTER*32 srnamt
230  INTEGER infot, nunit
231 * ..
232 * .. Common blocks ..
233  COMMON / infoc / infot, nunit, ok, lerr
234  COMMON / srnamc / srnamt
235 * ..
236 * .. Data statements ..
237  DATA iseedy / 1988, 1989, 1990, 1991 /
238  DATA uplos / 'U', 'L' /
239 * ..
240 * .. Executable Statements ..
241 *
242 * Initialize constants and the random number seed.
243 *
244  path( 1: 1 ) = 'Double precision'
245  path( 2: 3 ) = 'SY'
246  nrun = 0
247  nfail = 0
248  nerrs = 0
249  DO 10 i = 1, 4
250  iseed( i ) = iseedy( i )
251  10 CONTINUE
252 *
253 * Test the error exits
254 *
255  IF( tsterr )
256  \$ CALL derrsy( path, nout )
257  infot = 0
258 *
259 * Set the minimum block size for which the block routine should
260 * be used, which will be later returned by ILAENV
261 *
262  CALL xlaenv( 2, 2 )
263 *
264 * Do for each value of N in NVAL
265 *
266  DO 180 in = 1, nn
267  n = nval( in )
268  lda = max( n, 1 )
269  xtype = 'N'
270  nimat = ntypes
271  IF( n.LE.0 )
272  \$ nimat = 1
273 *
274  izero = 0
275 *
276 * Do for each value of matrix type IMAT
277 *
278  DO 170 imat = 1, nimat
279 *
280 * Do the tests only if DOTYPE( IMAT ) is true.
281 *
282  IF( .NOT.dotype( imat ) )
283  \$ GO TO 170
284 *
285 * Skip types 3, 4, 5, or 6 if the matrix size is too small.
286 *
287  zerot = imat.GE.3 .AND. imat.LE.6
288  IF( zerot .AND. n.LT.imat-2 )
289  \$ GO TO 170
290 *
291 * Do first for UPLO = 'U', then for UPLO = 'L'
292 *
293  DO 160 iuplo = 1, 2
294  uplo = uplos( iuplo )
295 *
296 * Begin generate the test matrix A.
297 *
298 *
299 * Set up parameters with DLATB4 for the matrix generator
300 * based on the type of matrix to be generated.
301 *
302  CALL dlatb4( path, imat, n, n, TYPE, kl, ku, anorm, mode,
303  \$ cndnum, dist )
304 *
305 * Generate a matrix with DLATMS.
306 *
307  srnamt = 'DLATMS'
308  CALL dlatms( n, n, dist, iseed, TYPE, rwork, mode,
309  \$ cndnum, anorm, kl, ku, uplo, a, lda, work,
310  \$ info )
311 *
312 * Check error code from DLATMS and handle error.
313 *
314  IF( info.NE.0 ) THEN
315  CALL alaerh( path, 'DLATMS', info, 0, uplo, n, n, -1,
316  \$ -1, -1, imat, nfail, nerrs, nout )
317 *
318 * Skip all tests for this generated matrix
319 *
320  GO TO 160
321  END IF
322 *
323 * For matrix types 3-6, zero one or more rows and
324 * columns of the matrix to test that INFO is returned
325 * correctly.
326 *
327  IF( zerot ) THEN
328  IF( imat.EQ.3 ) THEN
329  izero = 1
330  ELSE IF( imat.EQ.4 ) THEN
331  izero = n
332  ELSE
333  izero = n / 2 + 1
334  END IF
335 *
336  IF( imat.LT.6 ) THEN
337 *
338 * Set row and column IZERO to zero.
339 *
340  IF( iuplo.EQ.1 ) THEN
341  ioff = ( izero-1 )*lda
342  DO 20 i = 1, izero - 1
343  a( ioff+i ) = zero
344  20 CONTINUE
345  ioff = ioff + izero
346  DO 30 i = izero, n
347  a( ioff ) = zero
348  ioff = ioff + lda
349  30 CONTINUE
350  ELSE
351  ioff = izero
352  DO 40 i = 1, izero - 1
353  a( ioff ) = zero
354  ioff = ioff + lda
355  40 CONTINUE
356  ioff = ioff - izero
357  DO 50 i = izero, n
358  a( ioff+i ) = zero
359  50 CONTINUE
360  END IF
361  ELSE
362  IF( iuplo.EQ.1 ) THEN
363 *
364 * Set the first IZERO rows and columns to zero.
365 *
366  ioff = 0
367  DO 70 j = 1, n
368  i2 = min( j, izero )
369  DO 60 i = 1, i2
370  a( ioff+i ) = zero
371  60 CONTINUE
372  ioff = ioff + lda
373  70 CONTINUE
374  ELSE
375 *
376 * Set the last IZERO rows and columns to zero.
377 *
378  ioff = 0
379  DO 90 j = 1, n
380  i1 = max( j, izero )
381  DO 80 i = i1, n
382  a( ioff+i ) = zero
383  80 CONTINUE
384  ioff = ioff + lda
385  90 CONTINUE
386  END IF
387  END IF
388  ELSE
389  izero = 0
390  END IF
391 *
392 * End generate the test matrix A.
393 *
394 * Do for each value of NB in NBVAL
395 *
396  DO 150 inb = 1, nnb
397 *
398 * Set the optimal blocksize, which will be later
399 * returned by ILAENV.
400 *
401  nb = nbval( inb )
402  CALL xlaenv( 1, nb )
403 *
404 * Copy the test matrix A into matrix AFAC which
405 * will be factorized in place. This is needed to
406 * preserve the test matrix A for subsequent tests.
407 *
408  CALL dlacpy( uplo, n, n, a, lda, afac, lda )
409 *
410 * Compute the L*D*L**T or U*D*U**T factorization of the
411 * matrix. IWORK stores details of the interchanges and
412 * the block structure of D. AINV is a work array for
413 * block factorization, LWORK is the length of AINV.
414 *
415  lwork = max( 2, nb )*lda
416  srnamt = 'DSYTRF'
417  CALL dsytrf( uplo, n, afac, lda, iwork, ainv, lwork,
418  \$ info )
419 *
420 * Adjust the expected value of INFO to account for
421 * pivoting.
422 *
423  k = izero
424  IF( k.GT.0 ) THEN
425  100 CONTINUE
426  IF( iwork( k ).LT.0 ) THEN
427  IF( iwork( k ).NE.-k ) THEN
428  k = -iwork( k )
429  GO TO 100
430  END IF
431  ELSE IF( iwork( k ).NE.k ) THEN
432  k = iwork( k )
433  GO TO 100
434  END IF
435  END IF
436 *
437 * Check error code from DSYTRF and handle error.
438 *
439  IF( info.NE.k )
440  \$ CALL alaerh( path, 'DSYTRF', info, k, uplo, n, n,
441  \$ -1, -1, nb, imat, nfail, nerrs, nout )
442 *
443 * Set the condition estimate flag if the INFO is not 0.
444 *
445  IF( info.NE.0 ) THEN
446  trfcon = .true.
447  ELSE
448  trfcon = .false.
449  END IF
450 *
451 *+ TEST 1
452 * Reconstruct matrix from factors and compute residual.
453 *
454  CALL dsyt01( uplo, n, a, lda, afac, lda, iwork, ainv,
455  \$ lda, rwork, result( 1 ) )
456  nt = 1
457 *
458 *+ TEST 2
459 * Form the inverse and compute the residual,
460 * if the factorization was competed without INFO > 0
461 * (i.e. there is no zero rows and columns).
462 * Do it only for the first block size.
463 *
464  IF( inb.EQ.1 .AND. .NOT.trfcon ) THEN
465  CALL dlacpy( uplo, n, n, afac, lda, ainv, lda )
466  srnamt = 'DSYTRI2'
467  lwork = (n+nb+1)*(nb+3)
468  CALL dsytri2( uplo, n, ainv, lda, iwork, work,
469  \$ lwork, info )
470 *
471 * Check error code from DSYTRI2 and handle error.
472 *
473  IF( info.NE.0 )
474  \$ CALL alaerh( path, 'DSYTRI2', info, -1, uplo, n,
475  \$ n, -1, -1, -1, imat, nfail, nerrs,
476  \$ nout )
477 *
478 * Compute the residual for a symmetric matrix times
479 * its inverse.
480 *
481  CALL dpot03( uplo, n, a, lda, ainv, lda, work, lda,
482  \$ rwork, rcondc, result( 2 ) )
483  nt = 2
484  END IF
485 *
486 * Print information about the tests that did not pass
487 * the threshold.
488 *
489  DO 110 k = 1, nt
490  IF( result( k ).GE.thresh ) THEN
491  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
492  \$ CALL alahd( nout, path )
493  WRITE( nout, fmt = 9999 )uplo, n, nb, imat, k,
494  \$ result( k )
495  nfail = nfail + 1
496  END IF
497  110 CONTINUE
498  nrun = nrun + nt
499 *
500 * Skip the other tests if this is not the first block
501 * size.
502 *
503  IF( inb.GT.1 )
504  \$ GO TO 150
505 *
506 * Do only the condition estimate if INFO is not 0.
507 *
508  IF( trfcon ) THEN
509  rcondc = zero
510  GO TO 140
511  END IF
512 *
513 * Do for each value of NRHS in NSVAL.
514 *
515  DO 130 irhs = 1, nns
516  nrhs = nsval( irhs )
517 *
518 *+ TEST 3 ( Using TRS)
519 * Solve and compute residual for A * X = B.
520 *
521 * Choose a set of NRHS random solution vectors
522 * stored in XACT and set up the right hand side B
523 *
524  srnamt = 'DLARHS'
525  CALL dlarhs( path, xtype, uplo, ' ', n, n, kl, ku,
526  \$ nrhs, a, lda, xact, lda, b, lda,
527  \$ iseed, info )
528  CALL dlacpy( 'Full', n, nrhs, b, lda, x, lda )
529 *
530  srnamt = 'DSYTRS'
531  CALL dsytrs( uplo, n, nrhs, afac, lda, iwork, x,
532  \$ lda, info )
533 *
534 * Check error code from DSYTRS and handle error.
535 *
536  IF( info.NE.0 )
537  \$ CALL alaerh( path, 'DSYTRS', info, 0, uplo, n,
538  \$ n, -1, -1, nrhs, imat, nfail,
539  \$ nerrs, nout )
540 *
541  CALL dlacpy( 'Full', n, nrhs, b, lda, work, lda )
542 *
543 * Compute the residual for the solution
544 *
545  CALL dpot02( uplo, n, nrhs, a, lda, x, lda, work,
546  \$ lda, rwork, result( 3 ) )
547 *
548 *+ TEST 4 (Using TRS2)
549 *
550 * Solve and compute residual for A * X = B.
551 *
552 * Choose a set of NRHS random solution vectors
553 * stored in XACT and set up the right hand side B
554 *
555  srnamt = 'DLARHS'
556  CALL dlarhs( path, xtype, uplo, ' ', n, n, kl, ku,
557  \$ nrhs, a, lda, xact, lda, b, lda,
558  \$ iseed, info )
559  CALL dlacpy( 'Full', n, nrhs, b, lda, x, lda )
560 *
561  srnamt = 'DSYTRS2'
562  CALL dsytrs2( uplo, n, nrhs, afac, lda, iwork, x,
563  \$ lda, work, info )
564 *
565 * Check error code from DSYTRS2 and handle error.
566 *
567  IF( info.NE.0 )
568  \$ CALL alaerh( path, 'DSYTRS2', info, 0, uplo, n,
569  \$ n, -1, -1, nrhs, imat, nfail,
570  \$ nerrs, nout )
571 *
572  CALL dlacpy( 'Full', n, nrhs, b, lda, work, lda )
573 *
574 * Compute the residual for the solution
575 *
576  CALL dpot02( uplo, n, nrhs, a, lda, x, lda, work,
577  \$ lda, rwork, result( 4 ) )
578 *
579 *+ TEST 5
580 * Check solution from generated exact solution.
581 *
582  CALL dget04( n, nrhs, x, lda, xact, lda, rcondc,
583  \$ result( 5 ) )
584 *
585 *+ TESTS 6, 7, and 8
586 * Use iterative refinement to improve the solution.
587 *
588  srnamt = 'DSYRFS'
589  CALL dsyrfs( uplo, n, nrhs, a, lda, afac, lda,
590  \$ iwork, b, lda, x, lda, rwork,
591  \$ rwork( nrhs+1 ), work, iwork( n+1 ),
592  \$ info )
593 *
594 * Check error code from DSYRFS and handle error.
595 *
596  IF( info.NE.0 )
597  \$ CALL alaerh( path, 'DSYRFS', info, 0, uplo, n,
598  \$ n, -1, -1, nrhs, imat, nfail,
599  \$ nerrs, nout )
600 *
601  CALL dget04( n, nrhs, x, lda, xact, lda, rcondc,
602  \$ result( 6 ) )
603  CALL dpot05( uplo, n, nrhs, a, lda, b, lda, x, lda,
604  \$ xact, lda, rwork, rwork( nrhs+1 ),
605  \$ result( 7 ) )
606 *
607 * Print information about the tests that did not pass
608 * the threshold.
609 *
610  DO 120 k = 3, 8
611  IF( result( k ).GE.thresh ) THEN
612  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
613  \$ CALL alahd( nout, path )
614  WRITE( nout, fmt = 9998 )uplo, n, nrhs,
615  \$ imat, k, result( k )
616  nfail = nfail + 1
617  END IF
618  120 CONTINUE
619  nrun = nrun + 6
620 *
621 * End do for each value of NRHS in NSVAL.
622 *
623  130 CONTINUE
624 *
625 *+ TEST 9
626 * Get an estimate of RCOND = 1/CNDNUM.
627 *
628  140 CONTINUE
629  anorm = dlansy( '1', uplo, n, a, lda, rwork )
630  srnamt = 'DSYCON'
631  CALL dsycon( uplo, n, afac, lda, iwork, anorm, rcond,
632  \$ work, iwork( n+1 ), info )
633 *
634 * Check error code from DSYCON and handle error.
635 *
636  IF( info.NE.0 )
637  \$ CALL alaerh( path, 'DSYCON', info, 0, uplo, n, n,
638  \$ -1, -1, -1, imat, nfail, nerrs, nout )
639 *
640 * Compute the test ratio to compare values of RCOND
641 *
642  result( 9 ) = dget06( rcond, rcondc )
643 *
644 * Print information about the tests that did not pass
645 * the threshold.
646 *
647  IF( result( 9 ).GE.thresh ) THEN
648  IF( nfail.EQ.0 .AND. nerrs.EQ.0 )
649  \$ CALL alahd( nout, path )
650  WRITE( nout, fmt = 9997 )uplo, n, imat, 9,
651  \$ result( 9 )
652  nfail = nfail + 1
653  END IF
654  nrun = nrun + 1
655  150 CONTINUE
656 *
657  160 CONTINUE
658  170 CONTINUE
659  180 CONTINUE
660 *
661 * Print a summary of the results.
662 *
663  CALL alasum( path, nout, nfail, nrun, nerrs )
664 *
665  9999 FORMAT( ' UPLO = ''', a1, ''', N =', i5, ', NB =', i4, ', type ',
666  \$ i2, ', test ', i2, ', ratio =', g12.5 )
667  9998 FORMAT( ' UPLO = ''', a1, ''', N =', i5, ', NRHS=', i3, ', type ',
668  \$ i2, ', test(', i2, ') =', g12.5 )
669  9997 FORMAT( ' UPLO = ''', a1, ''', N =', i5, ',', 10x, ' type ', i2,
670  \$ ', test(', i2, ') =', g12.5 )
671  RETURN
672 *
673 * End of DCHKSY
674 *
subroutine dlatms(M, N, DIST, ISEED, SYM, D, MODE, COND, DMAX, KL, KU, PACK, A, LDA, WORK, INFO)
DLATMS
Definition: dlatms.f:323
subroutine dsycon(UPLO, N, A, LDA, IPIV, ANORM, RCOND, WORK, IWORK, INFO)
DSYCON
Definition: dsycon.f:132
subroutine dsytri2(UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO)
DSYTRI2
Definition: dsytri2.f:129
subroutine xlaenv(ISPEC, NVALUE)
XLAENV
Definition: xlaenv.f:83
double precision function dget06(RCOND, RCONDC)
DGET06
Definition: dget06.f:57
subroutine dget04(N, NRHS, X, LDX, XACT, LDXACT, RCOND, RESID)
DGET04
Definition: dget04.f:104
subroutine derrsy(PATH, NUNIT)
DERRSY
Definition: derrsy.f:57
subroutine dsyt01(UPLO, N, A, LDA, AFAC, LDAFAC, IPIV, C, LDC, RWORK, RESID)
DSYT01
Definition: dsyt01.f:126
subroutine alasum(TYPE, NOUT, NFAIL, NRUN, NERRS)
ALASUM
Definition: alasum.f:75
subroutine dpot05(UPLO, N, NRHS, A, LDA, B, LDB, X, LDX, XACT, LDXACT, FERR, BERR, RESLTS)
DPOT05
Definition: dpot05.f:166
subroutine dpot03(UPLO, N, A, LDA, AINV, LDAINV, WORK, LDWORK, RWORK, RCOND, RESID)
DPOT03
Definition: dpot03.f:127
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 dsytrs2(UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, INFO)
DSYTRS2
Definition: dsytrs2.f:134
subroutine alahd(IOUNIT, PATH)
ALAHD
Definition: alahd.f:107
subroutine dlatb4(PATH, IMAT, M, N, TYPE, KL, KU, ANORM, MODE, CNDNUM, DIST)
DLATB4
Definition: dlatb4.f:122
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 dsyrfs(UPLO, N, NRHS, A, LDA, AF, LDAF, IPIV, B, LDB, X, LDX, FERR, BERR, WORK, IWORK, INFO)
DSYRFS
Definition: dsyrfs.f:193
subroutine alaerh(PATH, SUBNAM, INFO, INFOE, OPTS, M, N, KL, KU, N5, IMAT, NFAIL, NERRS, NOUT)
ALAERH
Definition: alaerh.f:149
subroutine dsytrf(UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO)
DSYTRF
Definition: dsytrf.f:184
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 dpot02(UPLO, N, NRHS, A, LDA, X, LDX, B, LDB, RWORK, RESID)
DPOT02
Definition: dpot02.f:129
subroutine dsytrs(UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO)
DSYTRS
Definition: dsytrs.f:122
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