# dget04.f - Man Page

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

NAG Ltd.

Definition at line 101 of file dget04.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page dget04(3) is an alias of dget04.f(3).

Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK