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

```
_RST(3F)							      _RST(3F)

```

### NAME[Toc][Back]

```     RST, SRST	   -  EISPACK routine.	This subroutine	calls the recommended
sequence of subroutines from the eigensystem subroutine package (EISPACK)
to	find the eigenvalues and eigenvectors (if desired) of a	REAL SYMMETRIC
TRIDIAGONAL matrix.

```

### SYNOPSYS[Toc][Back]

```	  subroutine  rst(nm, n, w, e, matz, z,	ierr)
integer	   nm, n, matz,	ierr
double precision w(n), e(n), z(nm,n)

subroutine srst(nm, n, w, e, matz, z,	ierr)
integer	   nm, n, matz,	ierr
real		   w(n), e(n), z(nm,n)

```

### DESCRIPTION[Toc][Back]

```     On	Input

NM	must be	set to the row dimension of the	two-dimensional	array
parameters	as declared in the calling program dimension statement.

N is the order of the matrix.

W contains	the diagonal elements of the real symmetric tridiagonal
matrix.

E contains	the subdiagonal	elements of the	matrix in its last N-1
POSITIONS.	 E(1) is arbitrary.

MATZ is an	integer	variable set equal to zero if only eigenvalues are
desired.  Otherwise it is set to any non-zero integer for both
eigenvalues and eigenvectors.  On Output

W contains	the eigenvalues	in ascending order.

Z contains	the eigenvectors if MATZ is not	zero.

IERR is an	integer	output variable	set equal to an	error completion code
described in section 2B of	the documentation.  The	normal completion code
is	zero.  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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