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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