 LAPACK  3.10.0 LAPACK: Linear Algebra PACKage

◆ cchkhs()

 subroutine cchkhs ( integer NSIZES, integer, dimension( * ) NN, integer NTYPES, logical, dimension( * ) DOTYPE, integer, dimension( 4 ) ISEED, real THRESH, integer NOUNIT, complex, dimension( lda, * ) A, integer LDA, complex, dimension( lda, * ) H, complex, dimension( lda, * ) T1, complex, dimension( lda, * ) T2, complex, dimension( ldu, * ) U, integer LDU, complex, dimension( ldu, * ) Z, complex, dimension( ldu, * ) UZ, complex, dimension( * ) W1, complex, dimension( * ) W3, complex, dimension( ldu, * ) EVECTL, complex, dimension( ldu, * ) EVECTR, complex, dimension( ldu, * ) EVECTY, complex, dimension( ldu, * ) EVECTX, complex, dimension( ldu, * ) UU, complex, dimension( * ) TAU, complex, dimension( * ) WORK, integer NWORK, real, dimension( * ) RWORK, integer, dimension( * ) IWORK, logical, dimension( * ) SELECT, real, dimension( 14 ) RESULT, integer INFO )

CCHKHS

Purpose:
CCHKHS  checks the nonsymmetric eigenvalue problem routines.

CGEHRD factors A as  U H U' , where ' means conjugate
transpose, H is hessenberg, and U is unitary.

CUNGHR generates the unitary matrix U.

CUNMHR multiplies a matrix by the unitary matrix U.

CHSEQR factors H as  Z T Z' , where Z is unitary and T
is upper triangular.  It also computes the eigenvalues,
w(1), ..., w(n); we define a diagonal matrix W whose
(diagonal) entries are the eigenvalues.

CTREVC computes the left eigenvector matrix L and the
right eigenvector matrix R for the matrix T.  The
columns of L are the complex conjugates of the left
eigenvectors of T.  The columns of R are the right
eigenvectors of T.  L is lower triangular, and R is
upper triangular.

CHSEIN computes the left eigenvector matrix Y and the
right eigenvector matrix X for the matrix H.  The
columns of Y are the complex conjugates of the left
eigenvectors of H.  The columns of X are the right
eigenvectors of H.  Y is lower triangular, and X is
upper triangular.

When CCHKHS is called, a number of matrix "sizes" ("n's") and a
number of matrix "types" are specified.  For each size ("n")
and each type of matrix, one matrix will be generated and used
to test the nonsymmetric eigenroutines.  For each matrix, 14
tests will be performed:

(1)     | A - U H U**H | / ( |A| n ulp )

(2)     | I - UU**H | / ( n ulp )

(3)     | H - Z T Z**H | / ( |H| n ulp )

(4)     | I - ZZ**H | / ( n ulp )

(5)     | A - UZ H (UZ)**H | / ( |A| n ulp )

(6)     | I - UZ (UZ)**H | / ( n ulp )

(7)     | T(Z computed) - T(Z not computed) | / ( |T| ulp )

(8)     | W(Z computed) - W(Z not computed) | / ( |W| ulp )

(9)     | TR - RW | / ( |T| |R| ulp )

(10)    | L**H T - W**H L | / ( |T| |L| ulp )

(11)    | HX - XW | / ( |H| |X| ulp )

(12)    | Y**H H - W**H Y | / ( |H| |Y| ulp )

(13)    | AX - XW | / ( |A| |X| ulp )

(14)    | Y**H A - W**H Y | / ( |A| |Y| ulp )

The "sizes" are specified by an array NN(1:NSIZES); the value of
each element NN(j) specifies one size.
The "types" are specified by a logical array DOTYPE( 1:NTYPES );
if DOTYPE(j) is .TRUE., then matrix type "j" will be generated.
Currently, the list of possible types is:

(1)  The zero matrix.
(2)  The identity matrix.
(3)  A (transposed) Jordan block, with 1's on the diagonal.

(4)  A diagonal matrix with evenly spaced entries
1, ..., ULP  and random complex angles.
(ULP = (first number larger than 1) - 1 )
(5)  A diagonal matrix with geometrically spaced entries
1, ..., ULP  and random complex angles.
(6)  A diagonal matrix with "clustered" entries 1, ULP, ..., ULP
and random complex angles.

(7)  Same as (4), but multiplied by SQRT( overflow threshold )
(8)  Same as (4), but multiplied by SQRT( underflow threshold )

(9)  A matrix of the form  U' T U, where U is unitary and
T has evenly spaced entries 1, ..., ULP with random complex
angles on the diagonal and random O(1) entries in the upper
triangle.

(10) A matrix of the form  U' T U, where U is unitary and
T has geometrically spaced entries 1, ..., ULP with random
complex angles on the diagonal and random O(1) entries in
the upper triangle.

(11) A matrix of the form  U' T U, where U is unitary and
T has "clustered" entries 1, ULP,..., ULP with random
complex angles on the diagonal and random O(1) entries in
the upper triangle.

(12) A matrix of the form  U' T U, where U is unitary and
T has complex eigenvalues randomly chosen from
ULP < |z| < 1   and random O(1) entries in the upper
triangle.

(13) A matrix of the form  X' T X, where X has condition
SQRT( ULP ) and T has evenly spaced entries 1, ..., ULP
with random complex angles on the diagonal and random O(1)
entries in the upper triangle.

(14) A matrix of the form  X' T X, where X has condition
SQRT( ULP ) and T has geometrically spaced entries
1, ..., ULP with random complex angles on the diagonal
and random O(1) entries in the upper triangle.

(15) A matrix of the form  X' T X, where X has condition
SQRT( ULP ) and T has "clustered" entries 1, ULP,..., ULP
with random complex angles on the diagonal and random O(1)
entries in the upper triangle.

(16) A matrix of the form  X' T X, where X has condition
SQRT( ULP ) and T has complex eigenvalues randomly chosen
from   ULP < |z| < 1   and random O(1) entries in the upper
triangle.

(17) Same as (16), but multiplied by SQRT( overflow threshold )
(18) Same as (16), but multiplied by SQRT( underflow threshold )

(19) Nonsymmetric matrix with random entries chosen from |z| < 1
(20) Same as (19), but multiplied by SQRT( overflow threshold )
(21) Same as (19), but multiplied by SQRT( underflow threshold )
NSIZES - INTEGER
The number of sizes of matrices to use.  If it is zero,
CCHKHS does nothing.  It must be at least zero.
Not modified.

NN     - INTEGER array, dimension (NSIZES)
An array containing the sizes to be used for the matrices.
Zero values will be skipped.  The values must be at least
zero.
Not modified.

NTYPES - INTEGER
The number of elements in DOTYPE.   If it is zero, CCHKHS
does nothing.  It must be at least zero.  If it is MAXTYP+1
and NSIZES is 1, then an additional type, MAXTYP+1 is
defined, which is to use whatever matrix is in A.  This
is only useful if DOTYPE(1:MAXTYP) is .FALSE. and
DOTYPE(MAXTYP+1) is .TRUE. .
Not modified.

DOTYPE - LOGICAL array, dimension (NTYPES)
If DOTYPE(j) is .TRUE., then for each size in NN a
matrix of that size and of type j will be generated.
If NTYPES is smaller than the maximum number of types
defined (PARAMETER MAXTYP), then types NTYPES+1 through
MAXTYP will not be generated.  If NTYPES is larger
than MAXTYP, DOTYPE(MAXTYP+1) through DOTYPE(NTYPES)
will be ignored.
Not modified.

ISEED  - INTEGER array, dimension (4)
On entry ISEED specifies the seed of the random number
generator. The array elements should be between 0 and 4095;
if not they will be reduced mod 4096.  Also, ISEED(4) must
be odd.  The random number generator uses a linear
congruential sequence limited to small integers, and so
should produce machine independent random numbers. The
values of ISEED are changed on exit, and can be used in the
next call to CCHKHS to continue the same random number
sequence.
Modified.

THRESH - REAL
A test will count as "failed" if the "error", computed as
described above, exceeds THRESH.  Note that the error
is scaled to be O(1), so THRESH should be a reasonably
small multiple of 1, e.g., 10 or 100.  In particular,
it should not depend on the precision (single vs. double)
or the size of the matrix.  It must be at least zero.
Not modified.

NOUNIT - INTEGER
The FORTRAN unit number for printing out error messages
(e.g., if a routine returns IINFO not equal to 0.)
Not modified.

A      - COMPLEX array, dimension (LDA,max(NN))
Used to hold the matrix whose eigenvalues are to be
computed.  On exit, A contains the last matrix actually
used.
Modified.

LDA    - INTEGER
The leading dimension of A, H, T1 and T2.  It must be at
least 1 and at least max( NN ).
Not modified.

H      - COMPLEX array, dimension (LDA,max(NN))
The upper hessenberg matrix computed by CGEHRD.  On exit,
H contains the Hessenberg form of the matrix in A.
Modified.

T1     - COMPLEX array, dimension (LDA,max(NN))
The Schur (="quasi-triangular") matrix computed by CHSEQR
if Z is computed.  On exit, T1 contains the Schur form of
the matrix in A.
Modified.

T2     - COMPLEX array, dimension (LDA,max(NN))
The Schur matrix computed by CHSEQR when Z is not computed.
This should be identical to T1.
Modified.

LDU    - INTEGER
The leading dimension of U, Z, UZ and UU.  It must be at
least 1 and at least max( NN ).
Not modified.

U      - COMPLEX array, dimension (LDU,max(NN))
The unitary matrix computed by CGEHRD.
Modified.

Z      - COMPLEX array, dimension (LDU,max(NN))
The unitary matrix computed by CHSEQR.
Modified.

UZ     - COMPLEX array, dimension (LDU,max(NN))
The product of U times Z.
Modified.

W1     - COMPLEX array, dimension (max(NN))
The eigenvalues of A, as computed by a full Schur
decomposition H = Z T Z'.  On exit, W1 contains the
eigenvalues of the matrix in A.
Modified.

W3     - COMPLEX array, dimension (max(NN))
The eigenvalues of A, as computed by a partial Schur
decomposition (Z not computed, T only computed as much
as is necessary for determining eigenvalues).  On exit,
W3 contains the eigenvalues of the matrix in A, possibly
perturbed by CHSEIN.
Modified.

EVECTL - COMPLEX array, dimension (LDU,max(NN))
The conjugate transpose of the (upper triangular) left
eigenvector matrix for the matrix in T1.
Modified.

EVECTR - COMPLEX array, dimension (LDU,max(NN))
The (upper triangular) right eigenvector matrix for the
matrix in T1.
Modified.

EVECTY - COMPLEX array, dimension (LDU,max(NN))
The conjugate transpose of the left eigenvector matrix
for the matrix in H.
Modified.

EVECTX - COMPLEX array, dimension (LDU,max(NN))
The right eigenvector matrix for the matrix in H.
Modified.

UU     - COMPLEX array, dimension (LDU,max(NN))
Details of the unitary matrix computed by CGEHRD.
Modified.

TAU    - COMPLEX array, dimension (max(NN))
Further details of the unitary matrix computed by CGEHRD.
Modified.

WORK   - COMPLEX array, dimension (NWORK)
Workspace.
Modified.

NWORK  - INTEGER
The number of entries in WORK.  NWORK >= 4*NN(j)*NN(j) + 2.

RWORK  - REAL array, dimension (max(NN))
Workspace.  Could be equivalenced to IWORK, but not SELECT.
Modified.

IWORK  - INTEGER array, dimension (max(NN))
Workspace.
Modified.

SELECT - LOGICAL array, dimension (max(NN))
Workspace.  Could be equivalenced to IWORK, but not RWORK.
Modified.

RESULT - REAL array, dimension (14)
The values computed by the fourteen tests described above.
The values are currently limited to 1/ulp, to avoid
overflow.
Modified.

INFO   - INTEGER
If 0, then everything ran OK.
-1: NSIZES < 0
-2: Some NN(j) < 0
-3: NTYPES < 0
-6: THRESH < 0
-9: LDA < 1 or LDA < NMAX, where NMAX is max( NN(j) ).
-14: LDU < 1 or LDU < NMAX.
-26: NWORK too small.
If  CLATMR, CLATMS, or CLATME returns an error code, the
absolute value of it is returned.
If 1, then CHSEQR could not find all the shifts.
If 2, then the EISPACK code (for small blocks) failed.
If >2, then 30*N iterations were not enough to find an
eigenvalue or to decompose the problem.
Modified.

-----------------------------------------------------------------------

Some Local Variables and Parameters:
---- ----- --------- --- ----------

ZERO, ONE       Real 0 and 1.
MAXTYP          The number of types defined.
MTEST           The number of tests defined: care must be taken
that (1) the size of RESULT, (2) the number of
tests actually performed, and (3) MTEST agree.
NTEST           The number of tests performed on this matrix
so far.  This should be less than MTEST, and
equal to it by the last test.  It will be less
if any of the routines being tested indicates
that it could not compute the matrices that
would be tested.
NMAX            Largest value in NN.
NMATS           The number of matrices generated so far.
NERRS           The number of tests which have exceeded THRESH
so far (computed by SLAFTS).
COND, CONDS,
IMODE           Values to be passed to the matrix generators.
ANORM           Norm of A; passed to matrix generators.

OVFL, UNFL      Overflow and underflow thresholds.
ULP, ULPINV     Finest relative precision and its inverse.
RTOVFL, RTUNFL,
RTULP, RTULPI   Square roots of the previous 4 values.

The following four arrays decode JTYPE:
KTYPE(j)        The general type (1-10) for type "j".
KMODE(j)        The MODE value to be passed to the matrix
generator for type "j".
KMAGN(j)        The order of magnitude ( O(1),
O(overflow^(1/2) ), O(underflow^(1/2) )
KCONDS(j)       Selects whether CONDS is to be 1 or
1/sqrt(ulp).  (0 means irrelevant.)

Definition at line 407 of file cchkhs.f.

412 *
413 * -- LAPACK test routine --
414 * -- LAPACK is a software package provided by Univ. of Tennessee, --
415 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
416 *
417 * .. Scalar Arguments ..
418  INTEGER INFO, LDA, LDU, NOUNIT, NSIZES, NTYPES, NWORK
419  REAL THRESH
420 * ..
421 * .. Array Arguments ..
422  LOGICAL DOTYPE( * ), SELECT( * )
423  INTEGER ISEED( 4 ), IWORK( * ), NN( * )
424  REAL RESULT( 14 ), RWORK( * )
425  COMPLEX A( LDA, * ), EVECTL( LDU, * ),
426  \$ EVECTR( LDU, * ), EVECTX( LDU, * ),
427  \$ EVECTY( LDU, * ), H( LDA, * ), T1( LDA, * ),
428  \$ T2( LDA, * ), TAU( * ), U( LDU, * ),
429  \$ UU( LDU, * ), UZ( LDU, * ), W1( * ), W3( * ),
430  \$ WORK( * ), Z( LDU, * )
431 * ..
432 *
433 * =====================================================================
434 *
435 * .. Parameters ..
436  REAL ZERO, ONE
437  parameter( zero = 0.0e+0, one = 1.0e+0 )
438  COMPLEX CZERO, CONE
439  parameter( czero = ( 0.0e+0, 0.0e+0 ),
440  \$ cone = ( 1.0e+0, 0.0e+0 ) )
441  INTEGER MAXTYP
442  parameter( maxtyp = 21 )
443 * ..
444 * .. Local Scalars ..
446  INTEGER I, IHI, IINFO, ILO, IMODE, IN, ITYPE, J, JCOL,
447  \$ JJ, JSIZE, JTYPE, K, MTYPES, N, N1, NERRS,
448  \$ NMATS, NMAX, NTEST, NTESTT
449  REAL ANINV, ANORM, COND, CONDS, OVFL, RTOVFL, RTULP,
450  \$ RTULPI, RTUNFL, TEMP1, TEMP2, ULP, ULPINV, UNFL
451 * ..
452 * .. Local Arrays ..
453  INTEGER IDUMMA( 1 ), IOLDSD( 4 ), KCONDS( MAXTYP ),
454  \$ KMAGN( MAXTYP ), KMODE( MAXTYP ),
455  \$ KTYPE( MAXTYP )
456  REAL DUMMA( 4 )
457  COMPLEX CDUMMA( 4 )
458 * ..
459 * .. External Functions ..
460  REAL SLAMCH
461  EXTERNAL slamch
462 * ..
463 * .. External Subroutines ..
464  EXTERNAL ccopy, cgehrd, cgemm, cget10, cget22, chsein,
467  \$ slasum, xerbla
468 * ..
469 * .. Intrinsic Functions ..
470  INTRINSIC abs, max, min, real, sqrt
471 * ..
472 * .. Data statements ..
473  DATA ktype / 1, 2, 3, 5*4, 4*6, 6*6, 3*9 /
474  DATA kmagn / 3*1, 1, 1, 1, 2, 3, 4*1, 1, 1, 1, 1, 2,
475  \$ 3, 1, 2, 3 /
476  DATA kmode / 3*0, 4, 3, 1, 4, 4, 4, 3, 1, 5, 4, 3,
477  \$ 1, 5, 5, 5, 4, 3, 1 /
478  DATA kconds / 3*0, 5*0, 4*1, 6*2, 3*0 /
479 * ..
480 * .. Executable Statements ..
481 *
482 * Check for errors
483 *
484  ntestt = 0
485  info = 0
486 *
488  nmax = 0
489  DO 10 j = 1, nsizes
490  nmax = max( nmax, nn( j ) )
491  IF( nn( j ).LT.0 )
493  10 CONTINUE
494 *
495 * Check for errors
496 *
497  IF( nsizes.LT.0 ) THEN
498  info = -1
499  ELSE IF( badnn ) THEN
500  info = -2
501  ELSE IF( ntypes.LT.0 ) THEN
502  info = -3
503  ELSE IF( thresh.LT.zero ) THEN
504  info = -6
505  ELSE IF( lda.LE.1 .OR. lda.LT.nmax ) THEN
506  info = -9
507  ELSE IF( ldu.LE.1 .OR. ldu.LT.nmax ) THEN
508  info = -14
509  ELSE IF( 4*nmax*nmax+2.GT.nwork ) THEN
510  info = -26
511  END IF
512 *
513  IF( info.NE.0 ) THEN
514  CALL xerbla( 'CCHKHS', -info )
515  RETURN
516  END IF
517 *
518 * Quick return if possible
519 *
520  IF( nsizes.EQ.0 .OR. ntypes.EQ.0 )
521  \$ RETURN
522 *
523 * More important constants
524 *
525  unfl = slamch( 'Safe minimum' )
526  ovfl = slamch( 'Overflow' )
527  CALL slabad( unfl, ovfl )
528  ulp = slamch( 'Epsilon' )*slamch( 'Base' )
529  ulpinv = one / ulp
530  rtunfl = sqrt( unfl )
531  rtovfl = sqrt( ovfl )
532  rtulp = sqrt( ulp )
533  rtulpi = one / rtulp
534 *
535 * Loop over sizes, types
536 *
537  nerrs = 0
538  nmats = 0
539 *
540  DO 260 jsize = 1, nsizes
541  n = nn( jsize )
542  IF( n.EQ.0 )
543  \$ GO TO 260
544  n1 = max( 1, n )
545  aninv = one / real( n1 )
546 *
547  IF( nsizes.NE.1 ) THEN
548  mtypes = min( maxtyp, ntypes )
549  ELSE
550  mtypes = min( maxtyp+1, ntypes )
551  END IF
552 *
553  DO 250 jtype = 1, mtypes
554  IF( .NOT.dotype( jtype ) )
555  \$ GO TO 250
556  nmats = nmats + 1
557  ntest = 0
558 *
559 * Save ISEED in case of an error.
560 *
561  DO 20 j = 1, 4
562  ioldsd( j ) = iseed( j )
563  20 CONTINUE
564 *
565 * Initialize RESULT
566 *
567  DO 30 j = 1, 14
568  result( j ) = zero
569  30 CONTINUE
570 *
571 * Compute "A"
572 *
573 * Control parameters:
574 *
575 * KMAGN KCONDS KMODE KTYPE
576 * =1 O(1) 1 clustered 1 zero
577 * =2 large large clustered 2 identity
578 * =3 small exponential Jordan
579 * =4 arithmetic diagonal, (w/ eigenvalues)
580 * =5 random log hermitian, w/ eigenvalues
581 * =6 random general, w/ eigenvalues
582 * =7 random diagonal
583 * =8 random hermitian
584 * =9 random general
585 * =10 random triangular
586 *
587  IF( mtypes.GT.maxtyp )
588  \$ GO TO 100
589 *
590  itype = ktype( jtype )
591  imode = kmode( jtype )
592 *
593 * Compute norm
594 *
595  GO TO ( 40, 50, 60 )kmagn( jtype )
596 *
597  40 CONTINUE
598  anorm = one
599  GO TO 70
600 *
601  50 CONTINUE
602  anorm = ( rtovfl*ulp )*aninv
603  GO TO 70
604 *
605  60 CONTINUE
606  anorm = rtunfl*n*ulpinv
607  GO TO 70
608 *
609  70 CONTINUE
610 *
611  CALL claset( 'Full', lda, n, czero, czero, a, lda )
612  iinfo = 0
613  cond = ulpinv
614 *
615 * Special Matrices
616 *
617  IF( itype.EQ.1 ) THEN
618 *
619 * Zero
620 *
621  iinfo = 0
622  ELSE IF( itype.EQ.2 ) THEN
623 *
624 * Identity
625 *
626  DO 80 jcol = 1, n
627  a( jcol, jcol ) = anorm
628  80 CONTINUE
629 *
630  ELSE IF( itype.EQ.3 ) THEN
631 *
632 * Jordan Block
633 *
634  DO 90 jcol = 1, n
635  a( jcol, jcol ) = anorm
636  IF( jcol.GT.1 )
637  \$ a( jcol, jcol-1 ) = one
638  90 CONTINUE
639 *
640  ELSE IF( itype.EQ.4 ) THEN
641 *
642 * Diagonal Matrix, [Eigen]values Specified
643 *
644  CALL clatmr( n, n, 'D', iseed, 'N', work, imode, cond,
645  \$ cone, 'T', 'N', work( n+1 ), 1, one,
646  \$ work( 2*n+1 ), 1, one, 'N', idumma, 0, 0,
647  \$ zero, anorm, 'NO', a, lda, iwork, iinfo )
648 *
649  ELSE IF( itype.EQ.5 ) THEN
650 *
651 * Hermitian, eigenvalues specified
652 *
653  CALL clatms( n, n, 'D', iseed, 'H', rwork, imode, cond,
654  \$ anorm, n, n, 'N', a, lda, work, iinfo )
655 *
656  ELSE IF( itype.EQ.6 ) THEN
657 *
658 * General, eigenvalues specified
659 *
660  IF( kconds( jtype ).EQ.1 ) THEN
661  conds = one
662  ELSE IF( kconds( jtype ).EQ.2 ) THEN
663  conds = rtulpi
664  ELSE
665  conds = zero
666  END IF
667 *
668  CALL clatme( n, 'D', iseed, work, imode, cond, cone,
669  \$ 'T', 'T', 'T', rwork, 4, conds, n, n, anorm,
670  \$ a, lda, work( n+1 ), iinfo )
671 *
672  ELSE IF( itype.EQ.7 ) THEN
673 *
674 * Diagonal, random eigenvalues
675 *
676  CALL clatmr( n, n, 'D', iseed, 'N', work, 6, one, cone,
677  \$ 'T', 'N', work( n+1 ), 1, one,
678  \$ work( 2*n+1 ), 1, one, 'N', idumma, 0, 0,
679  \$ zero, anorm, 'NO', a, lda, iwork, iinfo )
680 *
681  ELSE IF( itype.EQ.8 ) THEN
682 *
683 * Hermitian, random eigenvalues
684 *
685  CALL clatmr( n, n, 'D', iseed, 'H', work, 6, one, cone,
686  \$ 'T', 'N', work( n+1 ), 1, one,
687  \$ work( 2*n+1 ), 1, one, 'N', idumma, n, n,
688  \$ zero, anorm, 'NO', a, lda, iwork, iinfo )
689 *
690  ELSE IF( itype.EQ.9 ) THEN
691 *
692 * General, random eigenvalues
693 *
694  CALL clatmr( n, n, 'D', iseed, 'N', work, 6, one, cone,
695  \$ 'T', 'N', work( n+1 ), 1, one,
696  \$ work( 2*n+1 ), 1, one, 'N', idumma, n, n,
697  \$ zero, anorm, 'NO', a, lda, iwork, iinfo )
698 *
699  ELSE IF( itype.EQ.10 ) THEN
700 *
701 * Triangular, random eigenvalues
702 *
703  CALL clatmr( n, n, 'D', iseed, 'N', work, 6, one, cone,
704  \$ 'T', 'N', work( n+1 ), 1, one,
705  \$ work( 2*n+1 ), 1, one, 'N', idumma, n, 0,
706  \$ zero, anorm, 'NO', a, lda, iwork, iinfo )
707 *
708  ELSE
709 *
710  iinfo = 1
711  END IF
712 *
713  IF( iinfo.NE.0 ) THEN
714  WRITE( nounit, fmt = 9999 )'Generator', iinfo, n, jtype,
715  \$ ioldsd
716  info = abs( iinfo )
717  RETURN
718  END IF
719 *
720  100 CONTINUE
721 *
722 * Call CGEHRD to compute H and U, do tests.
723 *
724  CALL clacpy( ' ', n, n, a, lda, h, lda )
725  ntest = 1
726 *
727  ilo = 1
728  ihi = n
729 *
730  CALL cgehrd( n, ilo, ihi, h, lda, work, work( n+1 ),
731  \$ nwork-n, iinfo )
732 *
733  IF( iinfo.NE.0 ) THEN
734  result( 1 ) = ulpinv
735  WRITE( nounit, fmt = 9999 )'CGEHRD', iinfo, n, jtype,
736  \$ ioldsd
737  info = abs( iinfo )
738  GO TO 240
739  END IF
740 *
741  DO 120 j = 1, n - 1
742  uu( j+1, j ) = czero
743  DO 110 i = j + 2, n
744  u( i, j ) = h( i, j )
745  uu( i, j ) = h( i, j )
746  h( i, j ) = czero
747  110 CONTINUE
748  120 CONTINUE
749  CALL ccopy( n-1, work, 1, tau, 1 )
750  CALL cunghr( n, ilo, ihi, u, ldu, work, work( n+1 ),
751  \$ nwork-n, iinfo )
752  ntest = 2
753 *
754  CALL chst01( n, ilo, ihi, a, lda, h, lda, u, ldu, work,
755  \$ nwork, rwork, result( 1 ) )
756 *
757 * Call CHSEQR to compute T1, T2 and Z, do tests.
758 *
759 * Eigenvalues only (W3)
760 *
761  CALL clacpy( ' ', n, n, h, lda, t2, lda )
762  ntest = 3
763  result( 3 ) = ulpinv
764 *
765  CALL chseqr( 'E', 'N', n, ilo, ihi, t2, lda, w3, uz, ldu,
766  \$ work, nwork, iinfo )
767  IF( iinfo.NE.0 ) THEN
768  WRITE( nounit, fmt = 9999 )'CHSEQR(E)', iinfo, n, jtype,
769  \$ ioldsd
770  IF( iinfo.LE.n+2 ) THEN
771  info = abs( iinfo )
772  GO TO 240
773  END IF
774  END IF
775 *
776 * Eigenvalues (W1) and Full Schur Form (T2)
777 *
778  CALL clacpy( ' ', n, n, h, lda, t2, lda )
779 *
780  CALL chseqr( 'S', 'N', n, ilo, ihi, t2, lda, w1, uz, ldu,
781  \$ work, nwork, iinfo )
782  IF( iinfo.NE.0 .AND. iinfo.LE.n+2 ) THEN
783  WRITE( nounit, fmt = 9999 )'CHSEQR(S)', iinfo, n, jtype,
784  \$ ioldsd
785  info = abs( iinfo )
786  GO TO 240
787  END IF
788 *
789 * Eigenvalues (W1), Schur Form (T1), and Schur Vectors (UZ)
790 *
791  CALL clacpy( ' ', n, n, h, lda, t1, lda )
792  CALL clacpy( ' ', n, n, u, ldu, uz, ldu )
793 *
794  CALL chseqr( 'S', 'V', n, ilo, ihi, t1, lda, w1, uz, ldu,
795  \$ work, nwork, iinfo )
796  IF( iinfo.NE.0 .AND. iinfo.LE.n+2 ) THEN
797  WRITE( nounit, fmt = 9999 )'CHSEQR(V)', iinfo, n, jtype,
798  \$ ioldsd
799  info = abs( iinfo )
800  GO TO 240
801  END IF
802 *
803 * Compute Z = U' UZ
804 *
805  CALL cgemm( 'C', 'N', n, n, n, cone, u, ldu, uz, ldu, czero,
806  \$ z, ldu )
807  ntest = 8
808 *
809 * Do Tests 3: | H - Z T Z' | / ( |H| n ulp )
810 * and 4: | I - Z Z' | / ( n ulp )
811 *
812  CALL chst01( n, ilo, ihi, h, lda, t1, lda, z, ldu, work,
813  \$ nwork, rwork, result( 3 ) )
814 *
815 * Do Tests 5: | A - UZ T (UZ)' | / ( |A| n ulp )
816 * and 6: | I - UZ (UZ)' | / ( n ulp )
817 *
818  CALL chst01( n, ilo, ihi, a, lda, t1, lda, uz, ldu, work,
819  \$ nwork, rwork, result( 5 ) )
820 *
821 * Do Test 7: | T2 - T1 | / ( |T| n ulp )
822 *
823  CALL cget10( n, n, t2, lda, t1, lda, work, rwork,
824  \$ result( 7 ) )
825 *
826 * Do Test 8: | W3 - W1 | / ( max(|W1|,|W3|) ulp )
827 *
828  temp1 = zero
829  temp2 = zero
830  DO 130 j = 1, n
831  temp1 = max( temp1, abs( w1( j ) ), abs( w3( j ) ) )
832  temp2 = max( temp2, abs( w1( j )-w3( j ) ) )
833  130 CONTINUE
834 *
835  result( 8 ) = temp2 / max( unfl, ulp*max( temp1, temp2 ) )
836 *
837 * Compute the Left and Right Eigenvectors of T
838 *
839 * Compute the Right eigenvector Matrix:
840 *
841  ntest = 9
842  result( 9 ) = ulpinv
843 *
844 * Select every other eigenvector
845 *
846  DO 140 j = 1, n
847  SELECT( j ) = .false.
848  140 CONTINUE
849  DO 150 j = 1, n, 2
850  SELECT( j ) = .true.
851  150 CONTINUE
852  CALL ctrevc( 'Right', 'All', SELECT, n, t1, lda, cdumma,
853  \$ ldu, evectr, ldu, n, in, work, rwork, iinfo )
854  IF( iinfo.NE.0 ) THEN
855  WRITE( nounit, fmt = 9999 )'CTREVC(R,A)', iinfo, n,
856  \$ jtype, ioldsd
857  info = abs( iinfo )
858  GO TO 240
859  END IF
860 *
861 * Test 9: | TR - RW | / ( |T| |R| ulp )
862 *
863  CALL cget22( 'N', 'N', 'N', n, t1, lda, evectr, ldu, w1,
864  \$ work, rwork, dumma( 1 ) )
865  result( 9 ) = dumma( 1 )
866  IF( dumma( 2 ).GT.thresh ) THEN
867  WRITE( nounit, fmt = 9998 )'Right', 'CTREVC',
868  \$ dumma( 2 ), n, jtype, ioldsd
869  END IF
870 *
871 * Compute selected right eigenvectors and confirm that
872 * they agree with previous right eigenvectors
873 *
874  CALL ctrevc( 'Right', 'Some', SELECT, n, t1, lda, cdumma,
875  \$ ldu, evectl, ldu, n, in, work, rwork, iinfo )
876  IF( iinfo.NE.0 ) THEN
877  WRITE( nounit, fmt = 9999 )'CTREVC(R,S)', iinfo, n,
878  \$ jtype, ioldsd
879  info = abs( iinfo )
880  GO TO 240
881  END IF
882 *
883  k = 1
884  match = .true.
885  DO 170 j = 1, n
886  IF( SELECT( j ) ) THEN
887  DO 160 jj = 1, n
888  IF( evectr( jj, j ).NE.evectl( jj, k ) ) THEN
889  match = .false.
890  GO TO 180
891  END IF
892  160 CONTINUE
893  k = k + 1
894  END IF
895  170 CONTINUE
896  180 CONTINUE
897  IF( .NOT.match )
898  \$ WRITE( nounit, fmt = 9997 )'Right', 'CTREVC', n, jtype,
899  \$ ioldsd
900 *
901 * Compute the Left eigenvector Matrix:
902 *
903  ntest = 10
904  result( 10 ) = ulpinv
905  CALL ctrevc( 'Left', 'All', SELECT, n, t1, lda, evectl, ldu,
906  \$ cdumma, ldu, n, in, work, rwork, iinfo )
907  IF( iinfo.NE.0 ) THEN
908  WRITE( nounit, fmt = 9999 )'CTREVC(L,A)', iinfo, n,
909  \$ jtype, ioldsd
910  info = abs( iinfo )
911  GO TO 240
912  END IF
913 *
914 * Test 10: | LT - WL | / ( |T| |L| ulp )
915 *
916  CALL cget22( 'C', 'N', 'C', n, t1, lda, evectl, ldu, w1,
917  \$ work, rwork, dumma( 3 ) )
918  result( 10 ) = dumma( 3 )
919  IF( dumma( 4 ).GT.thresh ) THEN
920  WRITE( nounit, fmt = 9998 )'Left', 'CTREVC', dumma( 4 ),
921  \$ n, jtype, ioldsd
922  END IF
923 *
924 * Compute selected left eigenvectors and confirm that
925 * they agree with previous left eigenvectors
926 *
927  CALL ctrevc( 'Left', 'Some', SELECT, n, t1, lda, evectr,
928  \$ ldu, cdumma, ldu, n, in, work, rwork, iinfo )
929  IF( iinfo.NE.0 ) THEN
930  WRITE( nounit, fmt = 9999 )'CTREVC(L,S)', iinfo, n,
931  \$ jtype, ioldsd
932  info = abs( iinfo )
933  GO TO 240
934  END IF
935 *
936  k = 1
937  match = .true.
938  DO 200 j = 1, n
939  IF( SELECT( j ) ) THEN
940  DO 190 jj = 1, n
941  IF( evectl( jj, j ).NE.evectr( jj, k ) ) THEN
942  match = .false.
943  GO TO 210
944  END IF
945  190 CONTINUE
946  k = k + 1
947  END IF
948  200 CONTINUE
949  210 CONTINUE
950  IF( .NOT.match )
951  \$ WRITE( nounit, fmt = 9997 )'Left', 'CTREVC', n, jtype,
952  \$ ioldsd
953 *
954 * Call CHSEIN for Right eigenvectors of H, do test 11
955 *
956  ntest = 11
957  result( 11 ) = ulpinv
958  DO 220 j = 1, n
959  SELECT( j ) = .true.
960  220 CONTINUE
961 *
962  CALL chsein( 'Right', 'Qr', 'Ninitv', SELECT, n, h, lda, w3,
963  \$ cdumma, ldu, evectx, ldu, n1, in, work, rwork,
964  \$ iwork, iwork, iinfo )
965  IF( iinfo.NE.0 ) THEN
966  WRITE( nounit, fmt = 9999 )'CHSEIN(R)', iinfo, n, jtype,
967  \$ ioldsd
968  info = abs( iinfo )
969  IF( iinfo.LT.0 )
970  \$ GO TO 240
971  ELSE
972 *
973 * Test 11: | HX - XW | / ( |H| |X| ulp )
974 *
975 * (from inverse iteration)
976 *
977  CALL cget22( 'N', 'N', 'N', n, h, lda, evectx, ldu, w3,
978  \$ work, rwork, dumma( 1 ) )
979  IF( dumma( 1 ).LT.ulpinv )
980  \$ result( 11 ) = dumma( 1 )*aninv
981  IF( dumma( 2 ).GT.thresh ) THEN
982  WRITE( nounit, fmt = 9998 )'Right', 'CHSEIN',
983  \$ dumma( 2 ), n, jtype, ioldsd
984  END IF
985  END IF
986 *
987 * Call CHSEIN for Left eigenvectors of H, do test 12
988 *
989  ntest = 12
990  result( 12 ) = ulpinv
991  DO 230 j = 1, n
992  SELECT( j ) = .true.
993  230 CONTINUE
994 *
995  CALL chsein( 'Left', 'Qr', 'Ninitv', SELECT, n, h, lda, w3,
996  \$ evecty, ldu, cdumma, ldu, n1, in, work, rwork,
997  \$ iwork, iwork, iinfo )
998  IF( iinfo.NE.0 ) THEN
999  WRITE( nounit, fmt = 9999 )'CHSEIN(L)', iinfo, n, jtype,
1000  \$ ioldsd
1001  info = abs( iinfo )
1002  IF( iinfo.LT.0 )
1003  \$ GO TO 240
1004  ELSE
1005 *
1006 * Test 12: | YH - WY | / ( |H| |Y| ulp )
1007 *
1008 * (from inverse iteration)
1009 *
1010  CALL cget22( 'C', 'N', 'C', n, h, lda, evecty, ldu, w3,
1011  \$ work, rwork, dumma( 3 ) )
1012  IF( dumma( 3 ).LT.ulpinv )
1013  \$ result( 12 ) = dumma( 3 )*aninv
1014  IF( dumma( 4 ).GT.thresh ) THEN
1015  WRITE( nounit, fmt = 9998 )'Left', 'CHSEIN',
1016  \$ dumma( 4 ), n, jtype, ioldsd
1017  END IF
1018  END IF
1019 *
1020 * Call CUNMHR for Right eigenvectors of A, do test 13
1021 *
1022  ntest = 13
1023  result( 13 ) = ulpinv
1024 *
1025  CALL cunmhr( 'Left', 'No transpose', n, n, ilo, ihi, uu,
1026  \$ ldu, tau, evectx, ldu, work, nwork, iinfo )
1027  IF( iinfo.NE.0 ) THEN
1028  WRITE( nounit, fmt = 9999 )'CUNMHR(L)', iinfo, n, jtype,
1029  \$ ioldsd
1030  info = abs( iinfo )
1031  IF( iinfo.LT.0 )
1032  \$ GO TO 240
1033  ELSE
1034 *
1035 * Test 13: | AX - XW | / ( |A| |X| ulp )
1036 *
1037 * (from inverse iteration)
1038 *
1039  CALL cget22( 'N', 'N', 'N', n, a, lda, evectx, ldu, w3,
1040  \$ work, rwork, dumma( 1 ) )
1041  IF( dumma( 1 ).LT.ulpinv )
1042  \$ result( 13 ) = dumma( 1 )*aninv
1043  END IF
1044 *
1045 * Call CUNMHR for Left eigenvectors of A, do test 14
1046 *
1047  ntest = 14
1048  result( 14 ) = ulpinv
1049 *
1050  CALL cunmhr( 'Left', 'No transpose', n, n, ilo, ihi, uu,
1051  \$ ldu, tau, evecty, ldu, work, nwork, iinfo )
1052  IF( iinfo.NE.0 ) THEN
1053  WRITE( nounit, fmt = 9999 )'CUNMHR(L)', iinfo, n, jtype,
1054  \$ ioldsd
1055  info = abs( iinfo )
1056  IF( iinfo.LT.0 )
1057  \$ GO TO 240
1058  ELSE
1059 *
1060 * Test 14: | YA - WY | / ( |A| |Y| ulp )
1061 *
1062 * (from inverse iteration)
1063 *
1064  CALL cget22( 'C', 'N', 'C', n, a, lda, evecty, ldu, w3,
1065  \$ work, rwork, dumma( 3 ) )
1066  IF( dumma( 3 ).LT.ulpinv )
1067  \$ result( 14 ) = dumma( 3 )*aninv
1068  END IF
1069 *
1070 * End of Loop -- Check for RESULT(j) > THRESH
1071 *
1072  240 CONTINUE
1073 *
1074  ntestt = ntestt + ntest
1075  CALL slafts( 'CHS', n, n, jtype, ntest, result, ioldsd,
1076  \$ thresh, nounit, nerrs )
1077 *
1078  250 CONTINUE
1079  260 CONTINUE
1080 *
1081 * Summary
1082 *
1083  CALL slasum( 'CHS', nounit, nerrs, ntestt )
1084 *
1085  RETURN
1086 *
1087  9999 FORMAT( ' CCHKHS: ', a, ' returned INFO=', i6, '.', / 9x, 'N=',
1088  \$ i6, ', JTYPE=', i6, ', ISEED=(', 3( i5, ',' ), i5, ')' )
1089  9998 FORMAT( ' CCHKHS: ', a, ' Eigenvectors from ', a, ' incorrectly ',
1090  \$ 'normalized.', / ' Bits of error=', 0p, g10.3, ',', 9x,
1091  \$ 'N=', i6, ', JTYPE=', i6, ', ISEED=(', 3( i5, ',' ), i5,
1092  \$ ')' )
1093  9997 FORMAT( ' CCHKHS: Selected ', a, ' Eigenvectors from ', a,
1094  \$ ' do not match other eigenvectors ', 9x, 'N=', i6,
1095  \$ ', JTYPE=', i6, ', ISEED=(', 3( i5, ',' ), i5, ')' )
1096 *
1097 * End of CCHKHS
1098 *
subroutine xerbla(SRNAME, INFO)
XERBLA
Definition: xerbla.f:60
subroutine ccopy(N, CX, INCX, CY, INCY)
CCOPY
Definition: ccopy.f:81
subroutine cgemm(TRANSA, TRANSB, M, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC)
CGEMM
Definition: cgemm.f:187
subroutine chst01(N, ILO, IHI, A, LDA, H, LDH, Q, LDQ, WORK, LWORK, RWORK, RESULT)
CHST01
Definition: chst01.f:140
subroutine cget10(M, N, A, LDA, B, LDB, WORK, RWORK, RESULT)
CGET10
Definition: cget10.f:99
subroutine cget22(TRANSA, TRANSE, TRANSW, N, A, LDA, E, LDE, W, WORK, RWORK, RESULT)
CGET22
Definition: cget22.f:144
subroutine clatms(M, N, DIST, ISEED, SYM, D, MODE, COND, DMAX, KL, KU, PACK, A, LDA, WORK, INFO)
CLATMS
Definition: clatms.f:332
subroutine clatme(N, DIST, ISEED, D, MODE, COND, DMAX, RSIGN, UPPER, SIM, DS, MODES, CONDS, KL, KU, ANORM, A, LDA, WORK, INFO)
CLATME
Definition: clatme.f:301
subroutine clatmr(M, N, DIST, ISEED, SYM, D, MODE, COND, DMAX, RSIGN, GRADE, DL, MODEL, CONDL, DR, MODER, CONDR, PIVTNG, IPIVOT, KL, KU, SPARSE, ANORM, PACK, A, LDA, IWORK, INFO)
CLATMR
Definition: clatmr.f:490
subroutine cgehrd(N, ILO, IHI, A, LDA, TAU, WORK, LWORK, INFO)
CGEHRD
Definition: cgehrd.f:167
subroutine claset(UPLO, M, N, ALPHA, BETA, A, LDA)
CLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Definition: claset.f:106
subroutine clacpy(UPLO, M, N, A, LDA, B, LDB)
CLACPY copies all or part of one two-dimensional array to another.
Definition: clacpy.f:103
subroutine cunmhr(SIDE, TRANS, M, N, ILO, IHI, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
CUNMHR
Definition: cunmhr.f:179
subroutine cunghr(N, ILO, IHI, A, LDA, TAU, WORK, LWORK, INFO)
CUNGHR
Definition: cunghr.f:126
subroutine chseqr(JOB, COMPZ, N, ILO, IHI, H, LDH, W, Z, LDZ, WORK, LWORK, INFO)
CHSEQR
Definition: chseqr.f:299
subroutine chsein(SIDE, EIGSRC, INITV, SELECT, N, H, LDH, W, VL, LDVL, VR, LDVR, MM, M, WORK, RWORK, IFAILL, IFAILR, INFO)
CHSEIN
Definition: chsein.f:245
subroutine ctrevc(SIDE, HOWMNY, SELECT, N, T, LDT, VL, LDVL, VR, LDVR, MM, M, WORK, RWORK, INFO)
CTREVC
Definition: ctrevc.f:218
subroutine slafts(TYPE, M, N, IMAT, NTESTS, RESULT, ISEED, THRESH, IOUNIT, IE)
SLAFTS
Definition: slafts.f:99
real function slamch(CMACH)
SLAMCH
Definition: slamch.f:68
subroutine slasum(TYPE, IOUNIT, IE, NRUN)
SLASUM
Definition: slasum.f:41
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