SUBROUTINE STRSL(T,LDT,N,B,JOB,INFO)
C***BEGIN PROLOGUE  STRSL
C***DATE WRITTEN   780814   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  D2A3
C***KEYWORDS  LINEAR ALGEBRA,LINPACK,MATRIX,SOLVE,TRIANGULAR
C***AUTHOR  STEWART, G. W., (U. OF MARYLAND)
C***PURPOSE  Solves systems of the form  T*X=B or TRANS(T)*X=B
C            where T is a TRIANGULAR matrix of order N.
C***DESCRIPTION
C
C     STRSL solves systems of the form
C
C                   T * X = B
C     or
C                   TRANS(T) * X = B
C
C     where T is a triangular matrix of order N.  Here TRANS(T)
C     denotes the transpose of the matrix T.
C
C     On Entry
C
C         T         REAL(LDT,N)
C                   T contains the matrix of the system.  The zero
C                   elements of the matrix are not referenced, and
C                   the corresponding elements of the array can be
C                   used to store other information.
C
C         LDT       INTEGER
C                   LDT is the leading dimension of the array T.
C
C         N         INTEGER
C                   N is the order of the system.
C
C         B         REAL(N).
C                   B contains the right hand side of the system.
C
C         JOB       INTEGER
C                   JOB specifies what kind of system is to be solved.
C                   If JOB is
C
C                        00   solve T*X=B, T lower triangular,
C                        01   solve T*X=B, T upper triangular,
C                        10   solve TRANS(T)*X=B, T lower triangular,
C                        11   solve TRANS(T)*X=B, T upper triangular.
C
C     On Return
C
C         B         B contains the solution, if INFO .EQ. 0.
C                   Otherwise B is unaltered.
C
C         INFO      INTEGER
C                   INFO contains zero if the system is nonsingular.
C                   Otherwise INFO contains the index of
C                   the first zero diagonal element of T.
C
C     LINPACK.  This version dated 08/14/78 .
C     G. W. Stewart, University of Maryland, Argonne National Lab.
C
C     Subroutines and Functions
C
C     BLAS SAXPY,SDOT
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  SAXPY,SDOT
C***END PROLOGUE  STRSL