cggbak
cggbak - form the right or left eigenvectors of a complex generalized eigenvalue problem A*x = lambda*B*x, by backward transformation on the computed eigenvectors of the balanced pair of matrices output by CGGBAL
SUBROUTINE CGGBAK( JOB, SIDE, N, ILO, IHI, LSCALE, RSCALE, M, V,
* LDV, INFO)
CHARACTER * 1 JOB, SIDE
COMPLEX V(LDV,*)
INTEGER N, ILO, IHI, M, LDV, INFO
REAL LSCALE(*), RSCALE(*)
SUBROUTINE CGGBAK_64( JOB, SIDE, N, ILO, IHI, LSCALE, RSCALE, M, V,
* LDV, INFO)
CHARACTER * 1 JOB, SIDE
COMPLEX V(LDV,*)
INTEGER*8 N, ILO, IHI, M, LDV, INFO
REAL LSCALE(*), RSCALE(*)
SUBROUTINE GGBAK( JOB, SIDE, [N], ILO, IHI, LSCALE, RSCALE, [M], V,
* [LDV], [INFO])
CHARACTER(LEN=1) :: JOB, SIDE
COMPLEX, DIMENSION(:,:) :: V
INTEGER :: N, ILO, IHI, M, LDV, INFO
REAL, DIMENSION(:) :: LSCALE, RSCALE
SUBROUTINE GGBAK_64( JOB, SIDE, [N], ILO, IHI, LSCALE, RSCALE, [M],
* V, [LDV], [INFO])
CHARACTER(LEN=1) :: JOB, SIDE
COMPLEX, DIMENSION(:,:) :: V
INTEGER(8) :: N, ILO, IHI, M, LDV, INFO
REAL, DIMENSION(:) :: LSCALE, RSCALE
#include <sunperf.h>
void cggbak(char job, char side, int n, int ilo, int ihi, float *lscale, float *rscale, int m, complex *v, int ldv, int *info);
void cggbak_64(char job, char side, long n, long ilo, long ihi, float *lscale, float *rscale, long m, complex *v, long ldv, long *info);
cggbak forms the right or left eigenvectors of a complex generalized
eigenvalue problem A*x = lambda*B*x, by backward transformation on
the computed eigenvectors of the balanced pair of matrices output by
CGGBAL.
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* JOB (input)
-
Specifies the type of backward transformation required:
-
* SIDE (input)
-
-
* N (input)
-
The number of rows of the matrix V. N >= 0.
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* ILO (input)
-
The integers ILO and IHI determined by CGGBAL.
1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.
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* IHI (input)
-
The integers ILO and IHI determined by CGGBAL.
1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.
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* LSCALE (input)
-
Details of the permutations and/or scaling factors applied
to the left side of A and B, as returned by CGGBAL.
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* RSCALE (input)
-
Details of the permutations and/or scaling factors applied
to the right side of A and B, as returned by CGGBAL.
-
* M (input)
-
The number of columns of the matrix V. M >= 0.
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* V (input/output)
-
On entry, the matrix of right or left eigenvectors to be
transformed, as returned by CTGEVC.
On exit, V is overwritten by the transformed eigenvectors.
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* LDV (input)
-
The leading dimension of the matrix V. LDV >= max(1,N).
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* INFO (output)
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