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man pages->IRIX man pages -> complib/REBAK (3)
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### Contents

```
_REBAK(3F)							    _REBAK(3F)

```

### NAME[Toc][Back]

```     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.

```

### SYNOPSYS[Toc][Back]

```	  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)

```

### DESCRIPTION[Toc][Back]

```     On	Input

NM	must be	set to the row dimension of two-dimensional 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

PPPPaaaaggggeeee 1111```
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