zgebak.f(3) LAPACK zgebak.f(3)
subroutine zgebak (JOB, SIDE, N, ILO, IHI, SCALE, M, V, LDV, INFO)
subroutine zgebak (characterJOB, characterSIDE, integerN, integerILO, integerIHI, double
precision, dimension( * )SCALE, integerM, complex*16, dimension( ldv, * )V, integerLDV,
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.
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
JOB must be the same as the argument JOB supplied to ZGEBAL.
SIDE is CHARACTER*1
= 'R': V contains right eigenvectors;
= 'L': V contains left eigenvectors.
N is INTEGER
The number of rows of the matrix V. N >= 0.
ILO is INTEGER
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 is DOUBLE PRECISION array, dimension (N)
Details of the permutation and scaling factors, as returned
M is INTEGER
The number of columns of the matrix V. M >= 0.
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 is INTEGER
The leading dimension of the array V. LDV >= max(1,N).
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 131 of file zgebak.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 zgebak.f(3)