SRC/dpttrs.f(3)

NAME
SRC/dpttrs.f

SYNOPSIS

  Functions/Subroutines
subroutine dpttrs (n, nrhs, d, e, b, ldb, info)
DPTTRS

Function/Subroutine Documentation

  subroutine dpttrs (integer n, integer nrhs, double precision, dimension( * ) d, double precision, dimension( * ) e, double precision, dimension( ldb, * ) b, integer ldb, integer info)

DPTTRS

Purpose:

    !>
    !> DPTTRS solves a tridiagonal system of the form
    !>    A * X = B
    !> using the L*D*L**T factorization of A computed by DPTTRF.  D is a
    !> diagonal matrix specified in the vector D, L is a unit bidiagonal
    !> matrix whose subdiagonal is specified in the vector E, and X and B
    !> are N by NRHS matrices.
    !>

Parameters
    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 DOUBLE PRECISION array, dimension (N)
    !>          The n diagonal elements of the diagonal matrix D from the
    !>          L*D*L**T factorization of A.
    !>

    E

    !>          E is DOUBLE PRECISION array, dimension (N-1)
    !>          The (n-1) subdiagonal elements of the unit bidiagonal factor
    !>          L from the L*D*L**T factorization of A.  E can also be regarded
    !>          as the superdiagonal of the unit bidiagonal factor U from the
    !>          factorization A = U**T*D*U.
    !>

    B

    !>          B is DOUBLE PRECISION 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 108 of file dpttrs.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.