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◆ Zgebak()
| Sub Zgebak |
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Job As |
String, |
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Side As |
String, |
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N As |
Long, |
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Ilo As |
Long, |
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Ihi As |
Long, |
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Scal() As |
Double, |
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M As |
Long, |
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V() As |
Complex, |
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Info As |
Long |
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Eigenvectors of original complex general matrix by backward transformation on balanced matrix
- Purpose
- This routine 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.
- Parameters
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| [in] | Job | Specifies the operations to be performed on A.
= "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 Zgebal. |
| [in] | Side | = "R": V contains right eigenvectors.
= "L": V contains left eigenvectors. |
| [in] | N | Order of the matrix A. (N >= 0) (If N = 0, returns without computation) |
| [in] | Ilo | |
| [in] | Ihi | The integers Ilo and Ihi determined by Zgebal. (1 <= Ilo <= Ihi <= N, if N > 0. Ilo = 1 and Ihi = 0, if N = 0) |
| [out] | Scal() | Array Scal(LScal - 1) (LScal >= N)
Details of the permutation and scaling factors, as returned by Zgebal. |
| [in] | M | The number of columns of the matrix V. (M >= 0) (If M = 0, returns without computation) |
| [in,out] | V() | Array V(LV1 - 1, LV2 - 1) (LV1 >= N, LV2 >= M)
[in] The matrix of right or left eigenvectors to be transformed, as returned by Zhsein or Ztrevc3.
[out] V() is overwritten by the transformed eigenvectors. |
| [out] | Info | = 0: Successful exit.
= -1: The argument Job had an illegal value. (Job <> "N", "P", "S" nor "B")
= -2: The argument Side had an illegal value. (Side <> "R" nor "L")
= -3: The argument N had an illegal value. (N < 0)
= -4: The argument Ilo had an illegal value. (Ilo < 1 or Ilo > N)
= -5: The argument Ihi had an illegal value. (Ihi < min(Ilo, N) or Ihi > N)
= -6: The argument Scal() is invalid.
= -7: The argument M had an illegal value. (M < 0)
= -8: The argument V() is invalid. |
- Reference
- LAPACK
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1.9.6