SUBROUTINE SGESL(A,LDA,N,IPVT,B,JOB)
C***BEGIN PROLOGUE  SGESL
C***DATE WRITTEN   780814   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  D2A1
C***KEYWORDS  LINEAR ALGEBRA,LINPACK,MATRIX,SOLVE
C***AUTHOR  MOLER, C. B., (U. OF NEW MEXICO)
C***PURPOSE  Solves the real system A*X=B or TRANS(A)*X=B
C            using the factors of SGECO or SGEFA
C***DESCRIPTION
C
C     SGESL solves the real system
C     A * X = B  or  TRANS(A) * X = B
C     using the factors computed by SGECO or SGEFA.
C
C     On Entry
C
C        A       REAL(LDA, N)
C                the output from SGECO or SGEFA.
C
C        LDA     INTEGER
C                the leading dimension of the array  A .
C
C        N       INTEGER
C                the order of the matrix  A .
C
C        IPVT    INTEGER(N)
C                the pivot vector from SGECO or SGEFA.
C
C        B       REAL(N)
C                the right hand side vector.
C
C        JOB     INTEGER
C                = 0         to solve  A*X = B ,
C                = nonzero   to solve  TRANS(A)*X = B  where
C                            TRANS(A)  is the transpose.
C
C     On Return
C
C        B       the solution vector  X .
C
C     Error Condition
C
C        A division by zero will occur if the input factor contains a
C        zero on the diagonal.  Technically, this indicates singularity,
C        but it is often caused by improper arguments or improper
C        setting of LDA .  It will not occur if the subroutines are
C        called correctly and if SGECO has set RCOND .GT. 0.0
C        or SGEFA has set INFO .EQ. 0 .
C
C     To compute  INVERSE(A) * C  where  C  is a matrix
C     with  P  columns
C           CALL SGECO(A,LDA,N,IPVT,RCOND,Z)
C           IF (RCOND is too small) GO TO ...
C           DO 10 J = 1, P
C              CALL SGESL(A,LDA,N,IPVT,C(1,J),0)
C        10 CONTINUE
C
C     LINPACK.  This version dated 08/14/78 .
C     Cleve Moler, University of New Mexico, Argonne National Lab.
C
C     Subroutines and Functions
C
C     BLAS SAXPY,SDOT
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  SGESL