SRC/dptts2.f(3)            Library Functions Manual            SRC/dptts2.f(3)

NAME
       SRC/dptts2.f

SYNOPSIS
   Functions/Subroutines
       subroutine dptts2 (n, nrhs, d, e, b, ldb)
           DPTTS2 solves a tridiagonal system of the form AX=B using the L D
           LH factorization computed by spttrf.

Function/Subroutine Documentation
   subroutine dptts2 (integer n, integer nrhs, double precision, dimension( *
       ) d, double precision, dimension( * ) e, double precision, dimension(
       ldb, * ) b, integer ldb)
       DPTTS2 solves a tridiagonal system of the form AX=B using the L D LH
       factorization computed by spttrf.

       Purpose:


            DPTTS2 solves a tridiagonal system of the form
               A * X = B
            using the L*D*L**T factorization of A computed by DPTTRF.  D is a
            diagonal matrix specified in the vector D, L is a unit bidiagonal
            matrix whose subdiagonal is specified in the vector E, and X and B
            are N by NRHS matrices.

       Parameters
           N

                     N is INTEGER
                     The order of the tridiagonal matrix A.  N >= 0.

           NRHS

                     NRHS is INTEGER
                     The number of right hand sides, i.e., the number of columns
                     of the matrix B.  NRHS >= 0.

           D

                     D is DOUBLE PRECISION array, dimension (N)
                     The n diagonal elements of the diagonal matrix D from the
                     L*D*L**T factorization of A.

           E

                     E is DOUBLE PRECISION array, dimension (N-1)
                     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
                     factorization A = U**T*D*U.

           B

                     B is DOUBLE PRECISION array, dimension (LDB,NRHS)
                     On entry, the right hand side vectors B for the system of
                     linear equations.
                     On exit, the solution vectors, X.

           LDB

                     LDB is INTEGER
                     The leading dimension of the array B.  LDB >= max(1,N).

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 101 of file dptts2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/dptts2.f(3)