Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3  - 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

SYNOPSIS

       SUBROUTINE CPTTRS( UPLO, N, NRHS, D, E, B, LDB, INFO )

           CHARACTER      UPLO

           INTEGER        INFO, LDB, N, NRHS

           REAL           D( * )

           COMPLEX        B( LDB, * ), E( * )

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.

ARGUMENTS

        UPLO    (input) 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       (input) INTEGER
                The order of the tridiagonal matrix A.  N >= 0.

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

        D       (input) 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       (input) 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       (input/output) 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     (input) INTEGER
                The leading dimension of the array B.  LDB >= max(1,N).

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

 LAPACK routine (version 3.3.1)             April 2011                            CPTTRS(3lapack)