SRC/sgebak.f(3)

NAME
SRC/sgebak.f

SYNOPSIS

  Functions/Subroutines
subroutine sgebak (job, side, n, ilo, ihi, scale, m, v, ldv, info)
SGEBAK

Function/Subroutine Documentation

  subroutine sgebak (character job, character side, integer n, integer ilo, integer ihi, real, dimension( * ) scale, integer m, real, dimension( ldv, * ) v, integer ldv, integer info)

SGEBAK

Purpose:

    !>
    !> SGEBAK forms the right or left eigenvectors of a real general matrix
    !> by backward transformation on the computed eigenvectors of the
    !> balanced matrix output by SGEBAL.
    !>

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 SGEBAL.
    !>

    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 SGEBAL.
    !>          1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.
    !>

    SCALE

    !>          SCALE is REAL array, dimension (N)
    !>          Details of the permutation and scaling factors, as returned
    !>          by SGEBAL.
    !>

    M

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

    V

    !>          V is REAL array, dimension (LDV,M)
    !>          On entry, the matrix of right or left eigenvectors to be
    !>          transformed, as returned by SHSEIN or STREVC.
    !>          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 128 of file sgebak.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.