dgebak
dgebak - form the right or left eigenvectors of a real general matrix by backward transformation on the computed eigenvectors of the balanced matrix output by SGEBAL
SUBROUTINE DGEBAK( JOB, SIDE, N, ILO, IHI, SCALE, M, V, LDV, INFO)
CHARACTER * 1 JOB, SIDE
INTEGER N, ILO, IHI, M, LDV, INFO
DOUBLE PRECISION SCALE(*), V(LDV,*)
SUBROUTINE DGEBAK_64( JOB, SIDE, N, ILO, IHI, SCALE, M, V, LDV,
* INFO)
CHARACTER * 1 JOB, SIDE
INTEGER*8 N, ILO, IHI, M, LDV, INFO
DOUBLE PRECISION SCALE(*), V(LDV,*)
SUBROUTINE GEBAK( JOB, SIDE, [N], ILO, IHI, SCALE, [M], V, [LDV],
* [INFO])
CHARACTER(LEN=1) :: JOB, SIDE
INTEGER :: N, ILO, IHI, M, LDV, INFO
REAL(8), DIMENSION(:) :: SCALE
REAL(8), DIMENSION(:,:) :: V
SUBROUTINE GEBAK_64( JOB, SIDE, [N], ILO, IHI, SCALE, [M], V, [LDV],
* [INFO])
CHARACTER(LEN=1) :: JOB, SIDE
INTEGER(8) :: N, ILO, IHI, M, LDV, INFO
REAL(8), DIMENSION(:) :: SCALE
REAL(8), DIMENSION(:,:) :: V
#include <sunperf.h>
void dgebak(char job, char side, int n, int ilo, int ihi, double *scale, int m, double *v, int ldv, int *info);
void dgebak_64(char job, char side, long n, long ilo, long ihi, double *scale, long m, double *v, long ldv, long *info);
dgebak 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.
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* JOB (input)
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Specifies the type of backward transformation required:
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* SIDE (input)
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* N (input)
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The number of rows of the matrix V. N >= 0.
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* ILO (input)
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The integers ILO and IHI determined by SGEBAL.
1 <= ILO <= IHI <= N, if N > 0; ILO=1 and IHI=0, if N=0.
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* IHI (input)
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See the description for ILO.
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* SCALE (input)
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Details of the permutation and scaling factors, as returned
by SGEBAL.
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* M (input)
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The number of columns of the matrix V. M >= 0.
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* V (input/output)
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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.
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* LDV (input)
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The leading dimension of the array V. LDV >= max(1,N).
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* INFO (output)
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