SRC/cptts2.f(3)            Library Functions Manual            SRC/cptts2.f(3)

NAME
       SRC/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 (integer iuplo, integer n, integer nrhs, real, dimension(
       * ) d, complex, dimension( * ) e, complex, dimension( ldb, * ) b,
       integer ldb)
       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 COMPLEX 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 112 of file cptts2.f.

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

LAPACK                          Version 3.12.0                 SRC/cptts2.f(3)