dgtts2 man page on YellowDog

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DGTTS2(l)			       )			     DGTTS2(l)

NAME
       DGTTS2 - solve one of the systems of equations A*X = B or A'*X = B,

SYNOPSIS
       SUBROUTINE DGTTS2( ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB )

	   INTEGER	  ITRANS, LDB, N, NRHS

	   INTEGER	  IPIV( * )

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

PURPOSE
       DGTTS2 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
       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) DOUBLE PRECISION array, dimension (N-1)
	       The (n-1) multipliers that define the matrix L from the LU fac‐
	       torization 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).

LAPACK version 3.0		 15 June 2000			     DGTTS2(l)
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