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

NAME
       SRC/dgttrs.f

SYNOPSIS
   Functions/Subroutines
       subroutine dgttrs (trans, n, nrhs, dl, d, du, du2, ipiv, b, ldb, info)
           DGTTRS

Function/Subroutine Documentation
   subroutine dgttrs (character trans, integer n, integer nrhs, double
       precision, dimension( * ) dl, double precision, dimension( * ) d,
       double precision, dimension( * ) du, double precision, dimension( * )
       du2, integer, dimension( * ) ipiv, double precision, dimension( ldb, *
       ) b, integer ldb, integer info)
       DGTTRS

       Purpose:


           !>
           !> DGTTRS solves one of the systems of equations
           !>    A*X = B  or  A**T*X = B,
           !> with a tridiagonal matrix A using the LU factorization computed
           !> by DGTTRF.
           !>

       Parameters
           TRANS

           !>          TRANS is CHARACTER*1
           !>          Specifies the form of the system of equations.
           !>          = 'N':  A * X = B  (No transpose)
           !>          = 'T':  A**T* X = B  (Transpose)
           !>          = 'C':  A**T* X = B  (Conjugate transpose = 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 DOUBLE PRECISION array, dimension (N-1)
           !>          The (n-1) multipliers that define the matrix L from the
           !>          LU factorization of A.
           !>

           D

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

           DU

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

           DU2

           !>          DU2 is DOUBLE PRECISION 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 DOUBLE PRECISION 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).
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 136 of file dgttrs.f.

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

LAPACK                          Version 3.12.0                 SRC/dgttrs.f(3)