SYNOPSIS
 SUBROUTINE ZGTTS2(
 ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB )
 INTEGER ITRANS, LDB, N, NRHS
 INTEGER IPIV( * )
 COMPLEX*16 B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( * )
PURPOSE
ZGTTS2 solves one of the systems of equationsA * X = B, A**T * X = B, or A**H * X = B, with a tridiagonal matrix A using the LU factorization computed by ZGTTRF.
ARGUMENTS
 ITRANS (input) INTEGER

Specifies the form of the system of equations.
= 0: A * X = B (No transpose)
= 1: A**T * X = B (Transpose)
= 2: A**H * X = B (Conjugate 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) COMPLEX*16 array, dimension (N1)
 The (n1) multipliers that define the matrix L from the LU factorization of A.
 D (input) COMPLEX*16 array, dimension (N)
 The n diagonal elements of the upper triangular matrix U from the LU factorization of A.
 DU (input) COMPLEX*16 array, dimension (N1)
 The (n1) elements of the first superdiagonal of U.
 DU2 (input) COMPLEX*16 array, dimension (N2)
 The (n2) elements of the second superdiagonal 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) COMPLEX*16 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).