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

NAME

       LAPACK-3  - computes the solution to a real system of linear equations A*X = B, where A is
       an N-by-N symmetric positive definite tridiagonal  matrix,  and  X  and  B  are  N-by-NRHS
       matrices

SYNOPSIS

       SUBROUTINE DPTSV( N, NRHS, D, E, B, LDB, INFO )

           INTEGER       INFO, LDB, N, NRHS

           DOUBLE        PRECISION B( LDB, * ), D( * ), E( * )

PURPOSE

       DPTSV computes the solution to a real system of linear equations A*X = B, where A is an N-
       by-N symmetric positive definite tridiagonal matrix, and X and B are N-by-NRHS matrices.
        A is factored as A = L*D*L**T, and the factored form of A is then
        used to solve the system of equations.

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.

        D       (input/output) DOUBLE PRECISION array, dimension (N)
                On entry, the n diagonal elements of the tridiagonal matrix
                A.  On exit, the n diagonal elements of the diagonal matrix
                D from the factorization A = L*D*L**T.

        E       (input/output) DOUBLE PRECISION array, dimension (N-1)
                On entry, the (n-1) subdiagonal elements of the tridiagonal
                matrix A.  On exit, the (n-1) subdiagonal elements of the
                unit bidiagonal factor L from the L*D*L**T factorization of
                A.  (E can also be regarded as the superdiagonal of the unit
                bidiagonal factor U from the U**T*D*U factorization of A.)

        B       (input/output) DOUBLE PRECISION 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, the leading minor of order i is not
                positive definite, and the solution has not been
                computed.  The factorization has not been completed
                unless i = N.

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