_REBAK(3F) _REBAK(3F)
REBAK, SREBAK  EISPACK routine. This subroutine forms the
eigenvectors of a generalized SYMMETRIC eigensystem by back transforming
those of the derived symmetric matrix determined by REDUC.
subroutine rebak(nm, n, b, dl, m, z)
integer nm, n, m
double precision b(nm,n), dl(n), z(nm,m)
subroutine srebak(nm, n, b, dl, m, z)
integer nm, n, m
real b(nm,n), dl(n), z(nm,m)
On Input
NM must be set to the row dimension of twodimensional array parameters
as declared in the calling program dimension statement.
N is the order of the matrix system.
B contains information about the similarity transformation (Cholesky
decomposition) used in the reduction by REDUC in its strict lower
triangle.
DL contains further information about the transformation.
M is the number of eigenvectors to be back transformed.
Z contains the eigenvectors to be back transformed in its first M
columns. On Output
Z contains the transformed eigenvectors in its first M columns.
Questions and comments should be directed to B. S. Garbow, APPLIED
MATHEMATICS DIVISION, ARGONNE NATIONAL LABORATORY
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