Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3 - solves the equation   A*X = B,

SYNOPSIS

       SUBROUTINE ZGTSV( N, NRHS, DL, D, DU, B, LDB, INFO )

           INTEGER       INFO, LDB, N, NRHS

           COMPLEX*16    B( LDB, * ), D( * ), DL( * ), DU( * )

PURPOSE

       ZGTSV  solves the equation
        where A is an N-by-N tridiagonal matrix, by Gaussian elimination with
        partial pivoting.
        Note that the equation  A**H *X = B  may be solved by interchanging the
        order of the arguments DU and DL.

ARGUMENTS

        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/output) COMPLEX*16 array, dimension (N-1)
                On entry, DL must contain the (n-1) subdiagonal elements of
                A.
                On exit, DL is overwritten by the (n-2) elements of the
                second superdiagonal of the upper triangular matrix U from
                the LU factorization of A, in DL(1), ..., DL(n-2).

        D       (input/output) COMPLEX*16 array, dimension (N)
                On entry, D must contain the diagonal elements of A.
                On exit, D is overwritten by the n diagonal elements of U.

        DU      (input/output) COMPLEX*16 array, dimension (N-1)
                On entry, DU must contain the (n-1) superdiagonal elements
                of A.
                On exit, DU is overwritten by the (n-1) elements of the first
                superdiagonal of U.

        B       (input/output) COMPLEX*16 array, dimension (LDB,NRHS)
                On entry, the N-by-NRHS right hand side matrix B.
                On exit, if INFO = 0, the N-by-NRHS 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
                > 0:  if INFO = i, U(i,i) is exactly zero, and the solution
                has not been computed.  The factorization has not been
                completed unless i = N.

 LAPACK routine (version 3.3.1)             April 2011                             ZGTSV(3lapack)