## MB04AZ

### Eigenvalues of a complex skew-Hamiltonian/Hamiltonian pencil in factored form

[Specification] [Arguments] [Method] [References] [Comments] [Example]

Purpose

      To compute the eigenvalues of a complex N-by-N skew-Hamiltonian/
      Hamiltonian pencil aS - bH, with

               H  T           (  B  F  )       (  Z11  Z12  )
        S = J Z  J  Z and H = (      H ), Z =: (            ).       (1)
                              (  G -B  )       (  Z21  Z22  )

      The structured Schur form of the embedded real skew-Hamiltonian/
                                                            H  T
      skew-Hamiltonian pencil, aB_S - bB_T, with B_S = J B_Z  J  B_Z,

              (  Re(Z11)  -Im(Z11)  |  Re(Z12)  -Im(Z12)  )
              (                     |                     )
              (  Im(Z11)   Re(Z11)  |  Im(Z12)   Re(Z12)  )
              (                     |                     )
        B_Z = (---------------------+---------------------) ,
              (                     |                     )
              (  Re(Z21)  -Im(Z21)  |  Re(Z22)  -Im(Z22)  )
              (                     |                     )
              (  Im(Z21)   Re(Z21)  |  Im(Z22)   Re(Z22)  )
                                                                     (2)
              ( -Im(B)  -Re(B)  | -Im(F)  -Re(F)  )
              (                 |                 )
              (  Re(B)  -Im(B)  |  Re(F)  -Im(F)  )
              (                 |                 )
        B_T = (-----------------+-----------------) ,  T = i*H,
              (                 |      T       T  )
              ( -Im(G)  -Re(G)  | -Im(B )  Re(B ) )
              (                 |      T       T  )
              (  Re(G)  -Im(G)  | -Re(B ) -Im(B ) )

      is determined and used to compute the eigenvalues. Optionally,
      if JOB = 'T', the pencil aB_S - bB_H is transformed by a unitary
      matrix Q and a unitary symplectic matrix U to the structured Schur
                                                    H  T
      form aB_Sout - bB_Hout, with B_Sout = J B_Zout  J  B_Zout,

                 ( BA  BD  )              ( BB  BF  )
        B_Zout = (         ) and B_Hout = (       H ),               (3)
                 (  0  BC  )              (  0 -BB  )

      where BA and BB are upper triangular, BC is lower triangular,
      and BF is Hermitian. B_H above is defined as B_H = -i*B_T.
      The embedding doubles the multiplicities of the eigenvalues of
      the pencil aS - bH.
      Optionally, if COMPQ = 'C', the unitary matrix Q is computed.
      Optionally, if COMPU = 'C', the unitary symplectic matrix U is
      computed.

Specification

          SUBROUTINE MB04AZ( JOB, COMPQ, COMPU, N, Z, LDZ, B, LDB, FG,
         $                   LDFG, D, LDD, C, LDC, Q, LDQ, U, LDU, ALPHAR,
         $                   ALPHAI, BETA, IWORK, LIWORK, DWORK, LDWORK,
         $                   ZWORK, LZWORK, BWORK, INFO )C     .. Scalar Arguments ..
          CHARACTER          COMPQ, COMPU, JOB
          INTEGER            INFO, LDB, LDC, LDD, LDFG, LDQ, LDU, LDWORK,
         $                   LDZ, LIWORK, LZWORK, N
    C     .. Array Arguments ..
          LOGICAL            BWORK( * )
          INTEGER            IWORK( * )
          DOUBLE PRECISION   ALPHAI( * ), ALPHAR( * ), BETA( * ), DWORK( * )
          COMPLEX*16         B( LDB, * ), C( LDC, * ), D( LDD, * ),
         $                   FG( LDFG, * ), Q( LDQ, * ), U( LDU, * ),
         $                   Z( LDZ, * ), ZWORK( * )

Arguments

Mode Parameters

      JOB     CHARACTER*1
              Specifies the computation to be performed, as follows:
              = 'E': compute the eigenvalues only; S and H will not
                     necessarily be transformed as in (3).
              = 'T': put S and H into the forms in (3) and return the
                     eigenvalues in ALPHAR, ALPHAI and BETA.

      COMPQ   CHARACTER*1
              Specifies whether to compute the unitary transformation
              matrix Q, as follows:
              = 'N': do not compute the unitary matrix Q;
              = 'C': the array Q is initialized internally to the unit
                     matrix, and the unitary matrix Q is returned.

      COMPU   CHARACTER*1
              Specifies whether to compute the unitary symplectic
              transformation matrix U, as follows:
              = 'N': do not compute the unitary symplectic matrix U;
              = 'C': the array U is initialized internally to the unit
                     matrix, and the unitary symplectic matrix U is
                     returned.

Input/Output Parameters

      N       (input) INTEGER
              Order of the pencil aS - bH.  N >= 0, even.

      Z       (input/output) COMPLEX*16 array, dimension (LDZ, N)
              On entry, the leading N-by-N part of this array must
              contain the non-trivial factor Z in the factorization
                     H  T
              S = J Z  J  Z of the skew-Hamiltonian matrix S.
              On exit, if JOB = 'T', the leading N-by-N part of this
              array contains the upper triangular matrix BA in (3)
              (see also METHOD). The strictly lower triangular part is
              not zeroed. The submatrix in the rows N/2+1 to N and the
              first N/2 columns is unchanged, except possibly for the
              entry (N/2+1,N/2), which might be set to zero.
              If JOB = 'E', this array is unchanged on exit.

      LDZ     INTEGER
              The leading dimension of the array Z.  LDZ >= MAX(1, N).

      B       (input/output) COMPLEX*16 array, dimension (LDB, K), where
              K = N, if JOB = 'T', and K = M, if JOB = 'E'.
              On entry, the leading N/2-by-N/2 part of this array must
              contain the matrix B.
              On exit, if JOB = 'T', the leading N-by-N part of this
              array contains the upper triangular matrix BB in (3)
              (see also METHOD).
              The strictly lower triangular part is not zeroed.
              If JOB = 'E', this array is unchanged on exit.

      LDB     INTEGER
              The leading dimension of the array B.
              LDB >= MAX(1, M), if JOB = 'E';
              LDB >= MAX(1, N), if JOB = 'T'.

      FG      (input/output) COMPLEX*16 array, dimension (LDFG, P),
              where P = MAX(M+1,N), if JOB = 'T', and
                    P = M+1,        if JOB = 'E'.
              On entry, the leading N/2-by-N/2 lower triangular part of
              this array must contain the lower triangular part of the
              Hermitian matrix G, and the N/2-by-N/2 upper triangular
              part of the submatrix in the columns 2 to N/2+1 of this
              array must contain the upper triangular part of the
              Hermitian matrix F. Accidental nonzero imaginary parts on
              the main diagonals of F and G do not perturb the results.
              On exit, if JOB = 'T', the leading N-by-N part of this
              array contains the Hermitian matrix BF in (3) (see also
              METHOD). The strictly lower triangular part of the input
              matrix is preserved. The diagonal elements might have tiny
              imaginary parts, since they have not been annihilated.
              If JOB = 'E', this array is unchanged on exit.

      LDFG    INTEGER
              The leading dimension of the array FG.
              LDFG >= MAX(1, M), if JOB = 'E';
              LDFG >= MAX(1, N), if JOB = 'T'.

      D       (output) COMPLEX*16 array, dimension (LDD, N)
              If JOB = 'T', the leading N-by-N part of this array
              contains the matrix BD in (3) (see also METHOD).
              If JOB = 'E', this array is not referenced.

      LDD     INTEGER
              The leading dimension of the array D.
              LDD >= 1,         if JOB = 'E';
              LDD >= MAX(1, N), if JOB = 'T'.

      C       (output) COMPLEX*16 array, dimension (LDC, N)
              If JOB = 'T', the leading N-by-N part of this array
              contains the lower triangular matrix BC in (3) (see also
              METHOD). The part over the first superdiagonal is not set.
              If JOB = 'E', this array is not referenced.

      LDC     INTEGER
              The leading dimension of the array C.
              LDC >= 1,         if JOB = 'E';
              LDC >= MAX(1, N), if JOB = 'T'.

      Q       (output) COMPLEX*16 array, dimension (LDQ, 2*N)
              On exit, if COMPQ = 'C' and JOB = 'T', then the leading
              2*N-by-2*N part of this array contains the unitary
              transformation matrix Q.
              If COMPQ = 'C' and JOB = 'E', this array contains the
              orthogonal transformation which reduced B_Z and B_T
              in the first step of the algorithm (see METHOD).
              If COMPQ = 'N', this array is not referenced.

      LDQ     INTEGER
              The leading dimension of the array Q.
              LDQ >= 1,           if COMPQ = 'N';
              LDQ >= MAX(1, 2*N), if COMPQ = 'C'.

      U       (output) COMPLEX*16 array, dimension (LDU, 2*N)
              On exit, if COMPU = 'C' and JOB = 'T', then the leading
              N-by-2*N part of this array contains the leading N-by-2*N
              part of the unitary symplectic transformation matrix U.
              If COMPU = 'C' and JOB = 'E', this array contains the
              first N rows of the transformation U which reduced B_Z
              and B_T in the first step of the algorithm (see METHOD).
              If COMPU = 'N', this array is not referenced.

      LDU     INTEGER
              The leading dimension of the array U.
              LDU >= 1,         if COMPU = 'N';
              LDU >= MAX(1, N), if COMPU = 'C'.

      ALPHAR  (output) DOUBLE PRECISION array, dimension (N)
              The real parts of each scalar alpha defining an eigenvalue
              of the pencil aS - bH.

      ALPHAI  (output) DOUBLE PRECISION array, dimension (N)
              The imaginary parts of each scalar alpha defining an
              eigenvalue of the pencil aS - bH.
              If ALPHAI(j) is zero, then the j-th eigenvalue is real.

      BETA    (output) DOUBLE PRECISION array, dimension (N)
              The scalars beta that define the eigenvalues of the pencil
              aS - bH.
              Together, the quantities alpha = (ALPHAR(j),ALPHAI(j)) and
              beta = BETA(j) represent the j-th eigenvalue of the pencil
              aS - bH, in the form lambda = alpha/beta. Since lambda may
              overflow, the ratios should not, in general, be computed.

Workspace

      IWORK   INTEGER array, dimension (LIWORK)
              On exit, if INFO = 3, IWORK(1) contains the number of
              (pairs of) possibly inaccurate eigenvalues, q <= N/2, and
              IWORK(2), ..., IWORK(q+1) indicate their indices.
              Specifically, a positive value is an index of a real or
              purely imaginary eigenvalue, corresponding to a 1-by-1
              block, while the absolute value of a negative entry in
              IWORK is an index to the first eigenvalue in a pair of
              consecutively stored eigenvalues, corresponding to a
              2-by-2 block. A 2-by-2 block may have two complex, two
              real, two purely imaginary, or one real and one purely
              imaginary eigenvalue. The blocks are those in B_T and B_S.
              For i = q+2, ..., 2*q+1, IWORK(i) contains a pointer to
              the starting location in DWORK of the i-th triplet of
              1-by-1 blocks, if IWORK(i-q) > 0, or 2-by-2 blocks,
              if IWORK(i-q) < 0, defining unreliable eigenvalues.
              IWORK(2*q+2) contains the number of the 1-by-1 blocks, and
              IWORK(2*q+3) contains the number of the 2-by-2 blocks,
              corresponding to unreliable eigenvalues. IWORK(2*q+4)
              contains the total number t of the 2-by-2 blocks.
              If INFO = 0, then q = 0, therefore IWORK(1) = 0.

      LIWORK  INTEGER
              The dimension of the array IWORK.  LIWORK >= 2*N+9.

      DWORK   DOUBLE PRECISION array, dimension (LDWORK)
              On exit, if INFO = 0 or INFO = 3, DWORK(1) returns the
              optimal LDWORK, and DWORK(2), ..., DWORK(4) contain the
              Frobenius norms of the factors of the formal matrix
              product used by the algorithm. In addition, DWORK(5), ...,
              DWORK(4+3*s) contain the s triplet values corresponding
              to the 1-by-1 blocks. Their eigenvalues are real or purely
              imaginary. Such an eigenvalue is obtained as -a1/a2/a3*i,
              where a1, ..., a3 are the corresponding triplet values,
              and i is the purely imaginary unit.
              Moreover, DWORK(5+3*s), ..., DWORK(4+3*s+12*t) contain the
              t groups of triplet 2-by-2 matrices corresponding to the
              2-by-2 blocks. Their eigenvalue pairs are either complex,
              or placed on the real and imaginary axes. Such an
              eigenvalue pair is given by imag( ev ) - real( ev )*i,
              where ev is the spectrum of the matrix product
              A1*inv(A2)*inv(A3), and A1, ..., A3 define the
              corresponding 2-by-2 matrix triplet.
              On exit, if INFO = -25, DWORK(1) returns the minimum
              value of LDWORK.

      LDWORK  INTEGER
              The dimension of the array DWORK.
              LDWORK >= c*N**2 + N + MAX(6*N, 27), where
                        c = 18, if                 COMPU = 'C';
                        c = 16, if COMPQ = 'C' and COMPU = 'N';
                        c = 13, if COMPQ = 'N' and COMPU = 'N'.
              For good performance LDWORK should be generally larger.

              If LDWORK = -1, then a workspace query is assumed;
              the routine only calculates the optimal size of the
              DWORK array, returns this value as the first entry of
              the DWORK array, and no error message related to LDWORK
              is issued by XERBLA.

      ZWORK   COMPLEX*16 array, dimension (LZWORK)
              On exit, if INFO = 0, ZWORK(1) returns the optimal LZWORK.
              On exit, if INFO = -27, ZWORK(1) returns the minimum
              value of LZWORK.

      LZWORK  INTEGER
              The dimension of the array ZWORK.
              LZWORK >= 8*N + 28, if JOB = 'T' and COMPQ = 'C';
              LZWORK >= 6*N + 28, if JOB = 'T' and COMPQ = 'N';
              LZWORK >= 1,        if JOB = 'E'.
              For good performance LZWORK should be generally larger.

              If LZWORK = -1, then a workspace query is assumed;
              the routine only calculates the optimal size of the
              ZWORK array, returns this value as the first entry of
              the ZWORK array, and no error message related to LZWORK
              is issued by XERBLA.

      BWORK   LOGICAL array, dimension (LBWORK)
              LBWORK >= 0, if JOB = 'E';
              LBWORK >= N, if JOB = 'T'.

Error Indicator

      INFO    INTEGER
              = 0: succesful exit;
              < 0: if INFO = -i, the i-th argument had an illegal value;
              = 1: the algorithm was not able to reveal information
                   about the eigenvalues from the 2-by-2 blocks in the
                   SLICOT Library routine MB03BD (called by MB04ED);
              = 2: periodic QZ iteration failed in the SLICOT Library
                   routines MB03BD or MB03BZ when trying to
                   triangularize the 2-by-2 blocks;
              = 3: some eigenvalues might be inaccurate. This is a
                   warning.

Method

      First T = i*H is set. Then, the embeddings, B_Z and B_T, of the
      matrices S and T, are determined and, subsequently, the SLICOT
      Library routine MB04ED is applied to compute the structured Schur
      form, i.e., the factorizations

      ~      T         (  BZ11  BZ12  )
      B_Z = U  B_Z Q = (              ) and
                       (    0   BZ22  )

      ~        T  T         (  T11  T12  )
      B_T = J Q  J  B_T Q = (          T ),
                            (   0   T11  )

      where Q is real orthogonal, U is real orthogonal symplectic, BZ11,
      BZ22' are upper triangular and T11 is upper quasi-triangular.
      If JOB = 'T', the 2-by-2 blocks are triangularized using the
      periodic QZ algorithm.

References

      [1] Benner, P., Byers, R., Mehrmann, V. and Xu, H.
          Numerical Computation of Deflating Subspaces of Embedded
          Hamiltonian Pencils.
          Tech. Rep. SFB393/99-15, Technical University Chemnitz,
          Germany, June 1999.

Numerical Aspects

                                                                3
      The algorithm is numerically backward stable and needs O(N )
      complex floating point operations.

Further Comments

      This routine does not perform any scaling of the matrices. Scaling
      might sometimes be useful, and it should be done externally.

Example

Program Text

    *     MB04AZ EXAMPLE PROGRAM TEXT
    *
    *     .. Parameters ..
          INTEGER            NIN, NOUT
          PARAMETER          ( NIN = 5, NOUT = 6 )
          INTEGER            NMAX
          PARAMETER          ( NMAX = 50 )
          INTEGER            LDB, LDC, LDD, LDFG, LDQ, LDU, LDWORK, LDZ,
         $                   LIWORK, LZWORK
          PARAMETER          ( LDB = NMAX,  LDC =   NMAX, LDD = NMAX,
         $                     LDFG = NMAX, LDQ = 2*NMAX, LDU = NMAX,
         $                     LDWORK = 18*NMAX*NMAX + NMAX + MAX( 2*NMAX,
         $                                                         24 ) + 3,
         $                     LDZ = NMAX, LIWORK = 2*NMAX + 9,
         $                     LZWORK = 8*NMAX + 28 )
    *
    *     .. Local Scalars ..
          CHARACTER          COMPQ, COMPU, JOB
          INTEGER            I, INFO, J, M, N
    *
    *     .. Local Arrays ..
          COMPLEX*16         B( LDB,   NMAX ),  C( LDC,   NMAX ),
         $                   D( LDD,   NMAX ), FG( LDFG,  NMAX ),
         $                   Q( LDQ, 2*NMAX ),  U( LDU, 2*NMAX ),
         $                   Z( LDZ,   NMAX ), ZWORK( LZWORK )
          DOUBLE PRECISION   ALPHAI( NMAX ), ALPHAR( NMAX ),
         $                   BETA(   NMAX ), DWORK(LDWORK )
          INTEGER            IWORK( LIWORK )
          LOGICAL            BWORK( NMAX )
    *
    *     .. External Functions ..
          LOGICAL            LSAME
          EXTERNAL           LSAME
    *
    *     .. External Subroutines ..
          EXTERNAL           MB04AZ
    *
    *     .. Intrinsic Functions ..
          INTRINSIC          MAX, MOD
    *
    *     .. Executable Statements ..
    *
          WRITE( NOUT, FMT = 99999 )
    *     Skip the heading in the data file and read in the data.
          READ( NIN, FMT = * )
          READ( NIN, FMT = * ) JOB, COMPQ, COMPU, N
          IF( N.LT.0 .OR. N.GT.NMAX .OR. MOD( N, 2 ).NE.0 ) THEN
             WRITE( NOUT, FMT = 99998 ) N
          ELSE
             READ( NIN, FMT = * ) ( (  Z( I, J ), J = 1, N ),     I=1, N )
             READ( NIN, FMT = * ) ( (  B( I, J ), J = 1, N/2 ),   I=1, N/2 )
             READ( NIN, FMT = * ) ( ( FG( I, J ), J = 1, N/2+1 ), I=1, N/2 )
    *        Compute the eigenvalues of a complex skew-Hamiltonian/
    *        Hamiltonian pencil (factored version).
             CALL MB04AZ( JOB, COMPQ, COMPU, N, Z, LDZ, B, LDB, FG, LDFG,
         $                D, LDD, C, LDC, Q, LDQ, U, LDU, ALPHAR, ALPHAI,
         $                BETA, IWORK, LIWORK, DWORK, LDWORK, ZWORK, LZWORK,
         $                BWORK, INFO )
    *
             IF( INFO.NE.0 ) THEN
                WRITE( NOUT, FMT = 99997 ) INFO
             ELSE
                M = N/2
                IF( LSAME( JOB, 'T' ) ) THEN
                   WRITE( NOUT, FMT = 99996 )
                   DO 10 I = 1, N
                      WRITE( NOUT, FMT = 99995 ) (  Z( I, J ), J = 1, N )
       10          CONTINUE
                   WRITE( NOUT, FMT = 99994 )
                   DO 20 I = 1, N
                      WRITE( NOUT, FMT = 99995 ) (  B( I, J ), J = 1, N )
       20          CONTINUE
                   WRITE( NOUT, FMT = 99993 )
                   DO 30 I = 1, N
                      WRITE( NOUT, FMT = 99995 ) ( FG( I, J ), J = 1, N )
       30          CONTINUE
                   WRITE( NOUT, FMT = 99992 )
                   DO 40 I = 1, N
                      WRITE( NOUT, FMT = 99995 ) (  D( I, J ), J = 1, N )
       40          CONTINUE
                   WRITE( NOUT, FMT = 99991 )
                   DO 50 I = 1, N
                      WRITE( NOUT, FMT = 99995 ) (  C( I, J ), J = 1, N )
       50          CONTINUE
                END IF
                IF( LSAME( COMPQ, 'C' ) ) THEN
                   WRITE( NOUT, FMT = 99990 )
                   DO 60 I = 1, 2*N
                      WRITE( NOUT, FMT = 99995 ) ( Q( I, J ), J = 1, 2*N )
       60          CONTINUE
                END IF
                IF( LSAME( COMPU, 'C' ) ) THEN
                   WRITE( NOUT, FMT = 99989 )
                   DO 70 I = 1, N
                      WRITE( NOUT, FMT = 99995 ) ( U( I, J ), J = 1, 2*N )
       70          CONTINUE
                END IF
                WRITE( NOUT, FMT = 99988 )
                WRITE( NOUT, FMT = 99987 ) ( ALPHAR( I ), I = 1, N )
                WRITE( NOUT, FMT = 99986 )
                WRITE( NOUT, FMT = 99987 ) ( ALPHAI( I ), I = 1, N )
                WRITE( NOUT, FMT = 99985 )
                WRITE( NOUT, FMT = 99987 ) (   BETA( I ), I = 1, N )
             END IF
          END IF
          STOP
    *
    99999 FORMAT ( 'MB04AZ EXAMPLE PROGRAM RESULTS', 1X )
    99998 FORMAT ( 'N is out of range.', /, 'N = ', I5 )
    99997 FORMAT ( 'INFO on exit from MB04AZ = ', I2 )
    99996 FORMAT (/' The transformed matrix Z is' )
    99995 FORMAT (20(1X,F9.4,SP,F9.4,S,'i '))
    99994 FORMAT (/' The transformed matrix B is' )
    99993 FORMAT (/' The transformed matrix FG is' )
    99992 FORMAT (/' The matrix D is' )
    99991 FORMAT (/' The matrix C is' )
    99990 FORMAT (/' The matrix Q is' )
    99989 FORMAT (/' The upper part of the matrix U is' )
    99988 FORMAT (/' The vector ALPHAR is ' )
    99987 FORMAT ( 50( 1X, F8.4 ) )
    99986 FORMAT (/' The vector ALPHAI is ' )
    99985 FORMAT (/' The vector BETA is ' )
          END

Program Data

    MB04AZ EXAMPLE PROGRAM DATA
    	T	C	C	4
       (0.4941,0.8054)   (0.8909,0.8865)   (0.0305,0.9786)   (0.9047,0.0596)
       (0.7790,0.5767)   (0.3341,0.0286)   (0.7440,0.7126)   (0.6098,0.6819)
       (0.7150,0.1829)   (0.6987,0.4899)   (0.5000,0.5004)   (0.6176,0.0424)
       (0.9037,0.2399)   (0.1978,0.1679)   (0.4799,0.4710)   (0.8594,0.0714)
       (0.5216,0.7224)   (0.8181,0.6596)
       (0.0967,0.1498)   (0.8175,0.5185)
        0.9729            0.8003           (0.4323,0.8313)
       (0.6489,0.1331)    0.4537            0.8253

Program Results

    MB04AZ EXAMPLE PROGRAM RESULTS

     The transformed matrix Z is
        0.4545  +0.0000i     0.7904  +0.0000i    -0.1601  +0.0000i    -0.2691  +0.0000i
        0.7790  +0.5767i     0.4273  +0.0000i     0.1459  +0.0000i     0.1298  +0.0000i
        0.7150  +0.1829i     0.6987  +0.4899i     0.6715  +0.0000i    -0.3001  +0.0000i
        0.9037  +0.2399i     0.1978  +0.1679i     0.4799  +0.4710i     0.7924  +0.0000i

     The transformed matrix B is
        0.0000  -1.7219i     0.0000  +0.7762i     0.0000  +0.5342i     0.0000  +0.0845i
        0.0000  +0.0000i     0.0000  +0.8862i     0.0000  +0.5186i     0.0000  -0.1429i
        0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +1.1122i     0.0000  +0.2898i
        0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.4889i

     The transformed matrix FG is
        0.0000  +0.0000i     0.0000  +0.4145i     0.0000  -0.7921i     0.0000  +0.5630i
        0.6489  +0.1331i     0.0000  +0.0000i     0.0000  +1.5982i     0.0000  +0.5818i
        0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.5819i
        0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i

     The matrix D is
        2.2139  +0.0000i     0.0402  +0.0000i    -0.2787  +0.0000i     1.0465  +0.0000i
       -0.5021  +0.0000i     0.5502  +0.0000i    -0.2771  +0.0000i    -0.4521  +0.0000i
       -0.0398  +0.0000i     0.4046  +0.0000i     0.0149  +0.0000i     0.7577  +0.0000i
       -0.1550  +0.0000i     2.0660  +0.0000i     1.6075  +0.0000i     0.5836  +0.0000i

     The matrix C is
        0.3159  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i
        0.7819  +0.0000i    -0.7575  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i
       -0.3494  +0.0000i     0.8622  +0.0000i     0.7539  +0.0000i     0.0000  +0.0000i
        1.1178  +0.0000i     0.3133  +0.0000i     0.4638  +0.0000i     1.2348  +0.0000i

     The matrix Q is
       -0.4983  +0.0000i     0.3694  +0.0000i    -0.4754  +0.0000i     0.2791  +0.0000i     0.1950  +0.0000i     0.2416  +0.0000i     0.1869  +0.0000i     0.4242  +0.0000i
       -0.1045  +0.0000i     0.3309  +0.0000i     0.5730  +0.0000i    -0.5566  +0.0000i     0.0877  +0.0000i     0.3543  +0.0000i     0.1761  +0.0000i     0.2779  +0.0000i
       -0.2586  +0.0000i    -0.4457  +0.0000i    -0.2838  +0.0000i    -0.5436  +0.0000i     0.5524  +0.0000i    -0.1064  +0.0000i    -0.2040  +0.0000i     0.0205  +0.0000i
       -0.0040  +0.0000i     0.3845  +0.0000i     0.2469  +0.0000i     0.2965  +0.0000i     0.5799  +0.0000i     0.0840  +0.0000i    -0.4788  +0.0000i    -0.3614  +0.0000i
        0.7958  +0.0000i     0.1597  +0.0000i    -0.3420  +0.0000i    -0.1047  +0.0000i     0.3370  +0.0000i     0.1813  +0.0000i     0.2275  +0.0000i     0.1229  +0.0000i
       -0.0600  +0.0000i    -0.4599  +0.0000i     0.3487  +0.0000i     0.3910  +0.0000i     0.4005  +0.0000i     0.1010  +0.0000i     0.5819  +0.0000i    -0.0345  +0.0000i
       -0.0539  +0.0000i     0.3817  +0.0000i     0.0501  +0.0000i    -0.1114  +0.0000i     0.1751  +0.0000i    -0.8212  +0.0000i     0.3606  +0.0000i    -0.0380  +0.0000i
        0.1846  +0.0000i    -0.1577  +0.0000i     0.2510  +0.0000i     0.2293  +0.0000i     0.0911  +0.0000i    -0.2834  +0.0000i    -0.3779  +0.0000i     0.7708  +0.0000i

     The upper part of the matrix U is
       -0.2544  +0.0000i    -0.1844  +0.0000i     0.7632  +0.0000i     0.5646  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i     0.0000  +0.0000i
        0.4272  +0.0000i    -0.0454  +0.0000i    -0.2918  +0.0000i     0.5721  +0.0000i     0.1446  +0.0000i    -0.1611  +0.0000i     0.3609  +0.0000i    -0.4752  +0.0000i
        0.6936  +0.0000i     0.3812  +0.0000i     0.2606  +0.0000i     0.0848  +0.0000i    -0.3359  +0.0000i    -0.1592  +0.0000i    -0.3242  +0.0000i     0.2348  +0.0000i
        0.2320  +0.0000i    -0.4483  +0.0000i    -0.1629  +0.0000i     0.1784  +0.0000i    -0.2898  +0.0000i     0.7525  +0.0000i    -0.0511  +0.0000i     0.1841  +0.0000i

     The vector ALPHAR is
       0.0000   0.0000   0.0000   0.0000

     The vector ALPHAI is
      -1.4991  -1.3690   1.0985   0.9993

     The vector BETA is
       0.1250   0.5000   0.5000   2.0000

Return to index