SRC/zgebak.f(3)            Library Functions Manual            SRC/zgebak.f(3)

NAME
       SRC/zgebak.f

SYNOPSIS
   Functions/Subroutines
       subroutine zgebak (job, side, n, ilo, ihi, scale, m, v, ldv, info)
           ZGEBAK

Function/Subroutine Documentation
   subroutine zgebak (character job, character side, integer n, integer ilo,
       integer ihi, double precision, dimension( * ) scale, integer m,
       complex*16, dimension( ldv, * ) v, integer ldv, integer info)
       ZGEBAK

       Purpose:


            ZGEBAK forms the right or left eigenvectors of a complex general
            matrix by backward transformation on the computed eigenvectors of the
            balanced matrix output by ZGEBAL.

       Parameters
           JOB

                     JOB is CHARACTER*1
                     Specifies the type of backward transformation required:
                     = 'N': do nothing, return immediately;
                     = 'P': do backward transformation for permutation only;
                     = 'S': do backward transformation for scaling only;
                     = 'B': do backward transformations for both permutation and
                            scaling.
                     JOB must be the same as the argument JOB supplied to ZGEBAL.

           SIDE

                     SIDE is CHARACTER*1
                     = 'R':  V contains right eigenvectors;
                     = 'L':  V contains left eigenvectors.

           N

                     N is INTEGER
                     The number of rows of the matrix V.  N >= 0.

           ILO

                     ILO is INTEGER

           IHI

                     IHI is INTEGER
                     The integers ILO and IHI determined by ZGEBAL.
                     1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.

           SCALE

                     SCALE is DOUBLE PRECISION array, dimension (N)
                     Details of the permutation and scaling factors, as returned
                     by ZGEBAL.

           M

                     M is INTEGER
                     The number of columns of the matrix V.  M >= 0.

           V

                     V is COMPLEX*16 array, dimension (LDV,M)
                     On entry, the matrix of right or left eigenvectors to be
                     transformed, as returned by ZHSEIN or ZTREVC.
                     On exit, V is overwritten by the transformed eigenvectors.

           LDV

                     LDV is INTEGER
                     The leading dimension of the array V. LDV >= max(1,N).

           INFO

                     INFO is INTEGER
                     = 0:  successful exit
                     < 0:  if INFO = -i, the i-th argument had an illegal value.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 129 of file zgebak.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/zgebak.f(3)