NAME

       sptts2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine sptts2 (N, NRHS, D, E, B, LDB)
           SPTTS2 solves a tridiagonal system of the form AX=B using the L D LH factorization
           computed by spttrf.

Function/Subroutine Documentation

   subroutine sptts2 (integerN, integerNRHS, real, dimension( * )D, real, dimension( * )E, real,
       dimension( ldb, * )B, integerLDB)
       SPTTS2 solves a tridiagonal system of the form AX=B using the L D LH factorization
       computed by spttrf.

       Purpose:

            SPTTS2 solves a tridiagonal system of the form
               A * X = B
            using the L*D*L**T factorization of A computed by SPTTRF.  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 REAL array, dimension (N)
                     The n diagonal elements of the diagonal matrix D from the
                     L*D*L**T factorization of A.

           E

                     E is REAL 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 REAL 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.

       Date:
           September 2012

       Definition at line 103 of file sptts2.f.

Author

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