redhat man page for sgtts2

SGTTS2(l)								 )								 SGTTS2(l)

NAME
       SGTTS2 - solve one of the systems of equations A*X = B or A'*X = B,

SYNOPSIS
       SUBROUTINE SGTTS2( ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB )

	   INTEGER	  ITRANS, LDB, N, NRHS

	   INTEGER	  IPIV( * )

	   REAL 	  B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( * )

PURPOSE
       SGTTS2  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 SGT-
       TRF.

ARGUMENTS
       ITRANS  (input) INTEGER
	       Specifies the form of the system of equations.  = 0:  A * X = B	(No transpose)
	       = 1:  A'* X = B	(Transpose)
	       = 2:  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) REAL array, dimension (N-1)
	       The (n-1) multipliers that define the matrix L from the LU factorization of A.

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

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

       DU2     (input) REAL 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) REAL 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).

LAPACK version 3.0						   15 June 2000 							 SGTTS2(l)