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LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
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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
Download CGEBAK + dependencies [TGZ] [ZIP] [TXT]
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.
[in] | 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. |
[in] | SIDE | SIDE is CHARACTER*1 = 'R': V contains right eigenvectors; = 'L': V contains left eigenvectors. |
[in] | N | N is INTEGER The number of rows of the matrix V. N >= 0. |
[in] | ILO | ILO is INTEGER |
[in] | 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. |
[in] | SCALE | SCALE is REAL array, dimension (N) Details of the permutation and scaling factors, as returned by CGEBAL. |
[in] | M | M is INTEGER The number of columns of the matrix V. M >= 0. |
[in,out] | 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. |
[in] | LDV | LDV is INTEGER The leading dimension of the array V. LDV >= max(1,N). |
[out] | INFO | INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value. |
Definition at line 133 of file cgebak.f.