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_RSB(3F)							      _RSB(3F)


NAME    [Toc]    [Back]

     RSB, SRSB	 -  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
     BAND matrix.

SYNOPSYS    [Toc]    [Back]

	  subroutine  rsb(nm, n, mb, a,	w, matz, z, fv1, fv2, ierr)
	  integer	    nm,	n, mb, matz, ierr
	  double precision a(nm,mb),w(n),z(nm,n),fv1(n),fv2(n)

	  subroutine srsb(nm, n, mb, a,	w, matz, z, fv1, fv2, ierr)
	  integer	    nm,	n, mb, matz, ierr
	  real		   a(nm,mb),w(n),z(nm,n),fv1(n),fv2(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  A.

     MB	is the half band width of the matrix, defined as the number of
     adjacent diagonals, including the principal diagonal, required to specify
     the non-zero portion of the lower triangle	of the matrix.

     A contains	the lower triangle of the real symmetric band matrix.  Its
     lowest subdiagonal	is stored in the last  N+1-MB  positions of the	first
     column, its next subdiagonal in the last  N+2-MB  positions of the	second
     column, further subdiagonals similarly, and finally its principal
     diagonal in the  N	 positions of the last column.	Contents of storages
     not part of the matrix are	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.

     FV1 and  FV2  are temporary storage arrays. Questions and comments	should
     be	directed to B. S. Garbow, APPLIED MATHEMATICS DIVISION,	ARGONNE
     NATIONAL LABORATORY


									PPPPaaaaggggeeee 1111
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