SUBROUTINE SPTSL(N,D,E,B)
C***BEGIN PROLOGUE  SPTSL
C***DATE WRITTEN   780814   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  D2B2A
C***KEYWORDS  LINEAR ALGEBRA,LINPACK,MATRIX,POSITIVE DEFINITE,SOLVE,
C             TRIDIAGONAL
C***AUTHOR  DONGARRA, J., (ANL)
C***PURPOSE  Solves the system A*X=B where A is POSITIVE DEFINITE
C            and TRIDIAGONAL
C***DESCRIPTION
C
C     SPTSL given a positive definite tridiagonal matrix and a right
C     hand side will find the solution.
C
C     On Entry
C
C        N        INTEGER
C                 is the order of the tridiagonal matrix.
C
C        D        REAL(N)
C                 is the diagonal of the tridiagonal matrix.
C                 On output, D is destroyed.
C
C        E        REAL(N)
C                 is the offdiagonal of the tridiagonal matrix.
C                 E(1) through E(N-1) should contain the
C                 offdiagonal.
C
C        B        REAL(N)
C                 is the right hand side vector.
C
C     On Return
C
C        B        contains the solution.
C
C     LINPACK.  This version dated 08/14/78 .
C     Jack Dongarra, Argonne National Laboratory.
C
C     No externals
C     Fortran MOD
C***REFERENCES  DONGARRA J.J., BUNCH J.R., MOLER C.B., STEWART G.W.,
C                 *LINPACK USERS  GUIDE*, SIAM, 1979.
C***ROUTINES CALLED  (NONE)
C***END PROLOGUE  SPTSL