DSYTRS - solve a system of linear equations A*X = B with a
       real symmetric  matrix  A  using  the  factorization  A  =
       U*D*U**T or A = L*D*L**T computed by DSYTRF


SYNOPSIS

       SUBROUTINE DSYTRS( UPLO,  N,  NRHS,  A, LDA, IPIV, B, LDB,
                          INFO )

           CHARACTER      UPLO

           INTEGER        INFO, LDA, LDB, N, NRHS

           INTEGER        IPIV( * )

           DOUBLE         PRECISION A( LDA, * ), B( LDB, * )


PURPOSE

       DSYTRS solves a system of linear equations A*X = B with  a
       real  symmetric  matrix  A  using  the  factorization  A =
       U*D*U**T or A = L*D*L**T computed by DSYTRF.


ARGUMENTS

       UPLO    (input) CHARACTER*1
               Specifies whether the details of the factorization
               are stored as an upper or lower triangular matrix.
               = 'U':  Upper triangular, form is A = U*D*U**T;
               = 'L':  Lower triangular, form is A = L*D*L**T.

       N       (input) INTEGER
               The order of the matrix A.  N >= 0.

       NRHS    (input) INTEGER
               The number of right hand sides, i.e.,  the  number
               of columns of the matrix B.  NRHS >= 0.

       A       (input) DOUBLE PRECISION array, dimension (LDA,N)
               The  block  diagonal  matrix D and the multipliers
               used to obtain the factor U or L  as  computed  by
               DSYTRF.

       LDA     (input) INTEGER
               The  leading  dimension  of  the  array A.  LDA >=
               max(1,N).

       IPIV    (input) INTEGER array, dimension (N)
               Details of the interchanges and the  block  struc­
               ture of D as determined by DSYTRF.

       B         (input/output)   DOUBLE   PRECISION   array,
               dimension (LDB,NRHS)
               On  entry, the right hand side matrix B.  On exit,
               the solution matrix X.

               The leading dimension of  the  array  B.   LDB  >=
               max(1,N).

       INFO    (output) INTEGER
               = 0:  successful exit
               < 0:  if INFO = -i, the i-th argument had an ille­
               gal value


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