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CGTTRS(3F)							    CGTTRS(3F)

NAME
     CGTTRS - solve one of the systems of equations  A * X = B, A**T * X = B,
     or A**H * X = B,

SYNOPSIS
     SUBROUTINE CGTTRS( TRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB, INFO )

	 CHARACTER	TRANS

	 INTEGER	INFO, LDB, N, NRHS

	 INTEGER	IPIV( * )

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

PURPOSE
     CGTTRS solves one of the systems of equations
	A * X = B,  A**T * X = B,  or  A**H * X = B, with a tridiagonal matrix
     A using the LU factorization computed by CGTTRF.

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

     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.

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

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

     DU	     (input) COMPLEX array, dimension (N-1)
	     The (n-1) elements of the first superdiagonal of U.

     DU2     (input) COMPLEX array, dimension (N-2)
	     The (n-2) 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

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CGTTRS(3F)							    CGTTRS(3F)

	     or i+1; IPIV(i) = i indicates a row interchange was not required.

     B	     (input/output) COMPLEX array, dimension (LDB,NRHS)
	     On entry, the right hand side matrix B.  On exit, B is
	     overwritten by 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

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