SRC/cgebak.f(3) | Library Functions Manual | SRC/cgebak.f(3) |
NAME
SRC/cgebak.f
SYNOPSIS
Functions/Subroutines
subroutine cgebak (job, side, n, ilo, ihi, scale, m, v,
ldv, info)
CGEBAK
Function/Subroutine Documentation
subroutine cgebak (character job, character side, integer n, integer ilo, integer ihi, real, dimension( * ) scale, integer m, complex, dimension( ldv, * ) v, integer ldv, integer info)
CGEBAK
Purpose:
!> !> CGEBAK forms the right or left eigenvectors of a complex general !> matrix by backward transformation on the computed eigenvectors of the !> balanced matrix output by CGEBAL. !>
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 CGEBAL. !>
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 CGEBAL. !> 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 CGEBAL. !>
M
!> M is INTEGER !> The number of columns of the matrix V. M >= 0. !>
V
!> V is COMPLEX array, dimension (LDV,M) !> On entry, the matrix of right or left eigenvectors to be !> transformed, as returned by CHSEIN or CTREVC. !> 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 cgebak.f.
Author
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