sgebak.f(3) LAPACK sgebak.f(3)
subroutine sgebak (JOB, SIDE, N, ILO, IHI, SCALE, M, V, LDV, INFO)
subroutine sgebak (characterJOB, characterSIDE, integerN, integerILO, integerIHI, real,
dimension( * )SCALE, integerM, real, dimension( ldv, * )V, integerLDV, integerINFO)
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.
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 SGEBAL.
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 SGEBAL.
1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.
SCALE is REAL 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 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 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 130 of file sgebak.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 sgebak.f(3)