---
name: "sget04.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/sget04.f"
---

# sget04.f(3)

## NAME

TESTING/LIN/sget04.f

## SYNOPSIS

### Functions/Subroutines

subroutine **sget04** (n, nrhs, x, ldx, xact, ldxact, rcond, resid)\
 **SGET04**

## Function/Subroutine Documentation

### subroutine sget04 (integer n, integer nrhs, real, dimension( ldx, \* ) x, integer ldx, real, dimension( ldxact, \* ) xact, integer ldxact, real rcond, real resid)

**SGET04**

**Purpose:**

```
!>
!> SGET04 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 REAL 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 REAL 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 REAL
!>          The reciprocal of the condition number of the coefficient
!>          matrix in the system of equations.
!>
```

*RESID*

```
!>          RESID is REAL
!>          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 **sget04.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.