SRC/cgtts2.f(3)            Library Functions Manual            SRC/cgtts2.f(3)

NAME
       SRC/cgtts2.f

SYNOPSIS
   Functions/Subroutines
       subroutine cgtts2 (itrans, n, nrhs, dl, d, du, du2, ipiv, b, ldb)
           CGTTS2 solves a system of linear equations with a tridiagonal
           matrix using the LU factorization computed by sgttrf.

Function/Subroutine Documentation
   subroutine cgtts2 (integer itrans, integer n, integer nrhs, complex,
       dimension( * ) dl, complex, dimension( * ) d, complex, dimension( * )
       du, complex, dimension( * ) du2, integer, dimension( * ) ipiv, complex,
       dimension( ldb, * ) b, integer ldb)
       CGTTS2 solves a system of linear equations with a tridiagonal matrix
       using the LU factorization computed by sgttrf.

       Purpose:


            CGTTS2 solves one of the systems of equations
               A * X = B,  A**T * X = B,  or  A**H * X = B,
            with a tridiagonal matrix A using the LU factorization computed
            by CGTTRF.

       Parameters
           ITRANS

                     ITRANS is INTEGER
                     Specifies the form of the system of equations.
                     = 0:  A * X = B     (No transpose)
                     = 1:  A**T * X = B  (Transpose)
                     = 2:  A**H * X = B  (Conjugate transpose)

           N

                     N is INTEGER
                     The order of the matrix A.

           NRHS

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

           DL

                     DL is COMPLEX array, dimension (N-1)
                     The (n-1) multipliers that define the matrix L from the
                     LU factorization of A.

           D

                     D is COMPLEX array, dimension (N)
                     The n diagonal elements of the upper triangular matrix U from
                     the LU factorization of A.

           DU

                     DU is COMPLEX array, dimension (N-1)
                     The (n-1) elements of the first super-diagonal of U.

           DU2

                     DU2 is COMPLEX array, dimension (N-2)
                     The (n-2) elements of the second super-diagonal of U.

           IPIV

                     IPIV is INTEGER array, dimension (N)
                     The pivot indices; for 1 <= i <= n, row i of the matrix was
                     interchanged with row IPIV(i).  IPIV(i) will always be either
                     i or i+1; IPIV(i) = i indicates a row interchange was not
                     required.

           B

                     B is COMPLEX array, dimension (LDB,NRHS)
                     On entry, the matrix of right hand side vectors B.
                     On exit, B is overwritten by 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 127 of file cgtts2.f.

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

LAPACK                          Version 3.12.0                 SRC/cgtts2.f(3)