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LAPACK version 3.0
dsptrs(3)

PURPOSE
  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

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

      CHARACTER	     UPLO

      INTEGER	     INFO, LDB, N, NRHS

      INTEGER	     IPIV( * )

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

DESCRIPTION
  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 structure 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 illegal value