TESTING/LIN/dptt02.f(3)

NAME
TESTING/LIN/dptt02.f

SYNOPSIS

  Functions/Subroutines
subroutine dptt02 (n, nrhs, d, e, x, ldx, b, ldb, resid)
DPTT02

Function/Subroutine Documentation

  subroutine dptt02 (integer n, integer nrhs, double precision, dimension( * ) d, double precision, dimension( * ) e, double precision, dimension( ldx, * ) x, integer ldx, double precision, dimension( ldb, * ) b, integer ldb, double precision resid)

DPTT02

Purpose:

    !>
    !> DPTT02 computes the residual for the solution to a symmetric
    !> tridiagonal system of equations:
    !>    RESID = norm(B - A*X) / (norm(A) * norm(X) * EPS),
    !> where EPS is the machine epsilon.
    !>

Parameters
    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 matrices B and X.  NRHS >= 0.
    !>

    D

    !>          D is DOUBLE PRECISION array, dimension (N)
    !>          The n diagonal elements of the tridiagonal matrix A.
    !>

    E

    !>          E is DOUBLE PRECISION array, dimension (N-1)
    !>          The (n-1) subdiagonal elements of the tridiagonal matrix A.
    !>

    X

    !>          X is DOUBLE PRECISION array, dimension (LDX,NRHS)
    !>          The n by nrhs matrix of solution vectors X.
    !>

    LDX

    !>          LDX is INTEGER
    !>          The leading dimension of the array X.  LDX >= max(1,N).
    !>

    B

    !>          B is DOUBLE PRECISION array, dimension (LDB,NRHS)
    !>          On entry, the n by nrhs matrix of right hand side vectors B.
    !>          On exit, B is overwritten with the difference B - A*X.
    !>

    LDB

    !>          LDB is INTEGER
    !>          The leading dimension of the array B.  LDB >= max(1,N).
    !>

    RESID

    !>          RESID is DOUBLE PRECISION
    !>          norm(B - A*X) / (norm(A) * norm(X) * EPS)
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 103 of file dptt02.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.