CXML
        	    
LAPACK version 3.0
dgttrs(3)

PURPOSE
  DGTTRS - solve one of the systems of equations A*X = B or A'*X = B,

SYNTAX
  SUBROUTINE DGTTRS( TRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB, INFO )

      CHARACTER	     TRANS

      INTEGER	     INFO, LDB, N, NRHS

      INTEGER	     IPIV( * )

      DOUBLE	     PRECISION B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( *
		     )

DESCRIPTION
  DGTTRS solves one of the systems of equations A*X = B or A'*X = B, with a
  tridiagonal matrix A using the LU factorization computed by DGTTRF.

ARGUMENTS
  TRANS	  (input) CHARACTER
	  Specifies the form of the system of equations.  = 'N':  A * X = B
	  (No transpose)
	  = 'T':  A'* X = B  (Transpose)
	  = 'C':  A'* X = B  (Conjugate transpose = Transpose)

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

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

  DL	  (input) DOUBLE PRECISION array, dimension (N-1)
	  The (n-1) multipliers that define the matrix L from the LU
	  factorization of A.

  D	  (input) DOUBLE PRECISION array, dimension (N)
	  The n diagonal elements of the upper triangular matrix U from the
	  LU factorization of A.

  DU	  (input) DOUBLE PRECISION array, dimension (N-1)
	  The (n-1) elements of the first super-diagonal of U.

  DU2	  (input) DOUBLE PRECISION array, dimension (N-2)
	  The (n-2) elements of the second super-diagonal of U.

  IPIV	  (input) INTEGER array, dimension (N)
	  The pivot indices; for 1 <= i <= n, row i of the matrix was
	  interchanged with row IPIV(i).  IPIV(i) will always be either i or
	  i+1; IPIV(i) = i indicates a row interchange was not required.

  B	  (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	  On entry, the matrix of right hand side vectors B.  On exit, B is
	  overwritten by the solution vectors 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