TESTING/LIN/dget04.f(3)

NAME
TESTING/LIN/dget04.f

SYNOPSIS

  Functions/Subroutines
subroutine dget04 (n, nrhs, x, ldx, xact, ldxact, rcond, resid)
DGET04

Function/Subroutine Documentation

  subroutine dget04 (integer n, integer nrhs, double precision, dimension( ldx, * ) x, integer ldx, double precision, dimension( ldxact, * ) xact, integer ldxact, double precision rcond, double precision resid)

DGET04

Purpose:

    !>
    !> DGET04 computes the difference between a computed solution and the
    !> true solution to a system of linear equations.
    !>
    !> RESID =  ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS ),
    !> where RCOND is the reciprocal of the condition number and EPS is the
    !> machine epsilon.
    !>

Parameters
    N

    !>          N is INTEGER
    !>          The number of rows of the matrices X and XACT.  N >= 0.
    !>

    NRHS

    !>          NRHS is INTEGER
    !>          The number of columns of the matrices X and XACT.  NRHS >= 0.
    !>

    X

    !>          X is DOUBLE PRECISION array, dimension (LDX,NRHS)
    !>          The computed solution vectors.  Each vector is stored as a
    !>          column of the matrix X.
    !>

    LDX

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

    XACT

    !>          XACT is DOUBLE PRECISION array, dimension( LDX, NRHS )
    !>          The exact solution vectors.  Each vector is stored as a
    !>          column of the matrix XACT.
    !>

    LDXACT

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

    RCOND

    !>          RCOND is DOUBLE PRECISION
    !>          The reciprocal of the condition number of the coefficient
    !>          matrix in the system of equations.
    !>

    RESID

    !>          RESID is DOUBLE PRECISION
    !>          The maximum over the NRHS solution vectors of
    !>          ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS )
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 101 of file dget04.f.

Author

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