NAME

       cptts2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine cptts2 (IUPLO, N, NRHS, D, E, B, LDB)
           CPTTS2 solves a tridiagonal system of the form AX=B using the L D LH factorization
           computed by spttrf.

Function/Subroutine Documentation

   subroutine cptts2 (integerIUPLO, integerN, integerNRHS, real, dimension( * )D, complex,
       dimension( * )E, complex, dimension( ldb, * )B, integerLDB)
       CPTTS2 solves a tridiagonal system of the form AX=B using the L D LH factorization
       computed by spttrf.

       Purpose:

            CPTTS2 solves a tridiagonal system of the form
               A * X = B
            using the factorization A = U**H*D*U or A = L*D*L**H computed by CPTTRF.
            D is a diagonal matrix specified in the vector D, U (or L) is a unit
            bidiagonal matrix whose superdiagonal (subdiagonal) is specified in
            the vector E, and X and B are N by NRHS matrices.

       Parameters:
           IUPLO

                     IUPLO is INTEGER
                     Specifies the form of the factorization and whether the
                     vector E is the superdiagonal of the upper bidiagonal factor
                     U or the subdiagonal of the lower bidiagonal factor L.
                     = 1:  A = U**H *D*U, E is the superdiagonal of U
                     = 0:  A = L*D*L**H, E is the subdiagonal of L

           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
                     factorization A = U**H *D*U or A = L*D*L**H.

           E

                     E is COMPLEX array, dimension (N-1)
                     If IUPLO = 1, the (n-1) superdiagonal elements of the unit
                     bidiagonal factor U from the factorization A = U**H*D*U.
                     If IUPLO = 0, the (n-1) subdiagonal elements of the unit
                     bidiagonal factor L from the factorization A = L*D*L**H.

           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 114 of file cptts2.f.

Author

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