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

NAME
       SRC/cpttrs.f

SYNOPSIS
   Functions/Subroutines
       subroutine cpttrs (uplo, n, nrhs, d, e, b, ldb, info)
           CPTTRS

Function/Subroutine Documentation
   subroutine cpttrs (character uplo, integer n, integer nrhs, real,
       dimension( * ) d, complex, dimension( * ) e, complex, dimension( ldb, *
       ) b, integer ldb, integer info)
       CPTTRS

       Purpose:


            CPTTRS 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
           UPLO

                     UPLO is CHARACTER*1
                     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.
                     = 'U':  A = U**H*D*U, E is the superdiagonal of U
                     = 'L':  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 UPLO = 'U', the (n-1) superdiagonal elements of the unit
                     bidiagonal factor U from the factorization A = U**H*D*U.
                     If UPLO = 'L', 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).

           INFO

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

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 120 of file cpttrs.f.

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

LAPACK                          Version 3.12.0                 SRC/cpttrs.f(3)