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NAME
     dsptrs - solve a system of linear equations A*X = B  with  a
     real  symmetric  matrix  A stored in packed format using the
     factorization A = U*D*U**T  or  A  =  L*D*L**T  computed  by
     DSPTRF

SYNOPSIS
     SUBROUTINE DSPTRS( UPLO, N, NRHS, AP, IPIV, B, LDB, INFO )

     CHARACTER UPLO

     INTEGER INFO, LDB, N, NRHS

     INTEGER IPIV( * )

     DOUBLE PRECISION AP( * ), B( LDB, * )



     #include <sunperf.h>

     void dsptrs(char uplo, int n, int  nrhs,  double  *dap,  int
               *ipivot, double *db, int ldb, int *info) ;

PURPOSE
     DSPTRS solves a system of linear equations A*X =  B  with  a
     real  symmetric  matrix  A stored in packed format using the
     factorization A = U*D*U**T  or  A  =  L*D*L**T  computed  by
     DSPTRF.


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.

     AP        (input)   DOUBLE   PRECISION   array,    dimension
               (N*(N+1)/2)
               The block diagonal matrix D  and  the  multipliers
               used  to  obtain  the factor U or L as computed by
               DSPTRF, stored as a packed triangular matrix.

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

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

     LDB       (input) INTEGER
               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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