---
name: "sget01.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/sget01.f"
---

# sget01.f(3)

## NAME

TESTING/LIN/sget01.f

## SYNOPSIS

### Functions/Subroutines

subroutine **sget01** (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)\
 **SGET01**

## Function/Subroutine Documentation

### subroutine sget01 (integer m, integer n, real, dimension( lda, \* ) a, integer lda, real, dimension( ldafac, \* ) afac, integer ldafac, integer, dimension( \* ) ipiv, real, dimension( \* ) rwork, real resid)

**SGET01**

**Purpose:**

```
!>
!> SGET01 reconstructs a matrix A from its L*U factorization and
!> computes the residual
!>    norm(L*U - A) / ( N * norm(A) * EPS ),
!> where EPS is the machine epsilon.
!>
```

**Parameters**

*M*

```
!>          M is INTEGER
!>          The number of rows of the matrix A.  M >= 0.
!>
```

*N*

```
!>          N is INTEGER
!>          The number of columns of the matrix A.  N >= 0.
!>
```

*A*

```
!>          A is REAL array, dimension (LDA,N)
!>          The original M x N matrix A.
!>
```

*LDA*

```
!>          LDA is INTEGER
!>          The leading dimension of the array A.  LDA >= max(1,M).
!>
```

*AFAC*

```
!>          AFAC is REAL array, dimension (LDAFAC,N)
!>          The factored form of the matrix A.  AFAC contains the factors
!>          L and U from the L*U factorization as computed by SGETRF.
!>          Overwritten with the reconstructed matrix, and then with the
!>          difference L*U - A.
!>
```

*LDAFAC*

```
!>          LDAFAC is INTEGER
!>          The leading dimension of the array AFAC.  LDAFAC >= max(1,M).
!>
```

*IPIV*

```
!>          IPIV is INTEGER array, dimension (N)
!>          The pivot indices from SGETRF.
!>
```

*RWORK*

```
!>          RWORK is REAL array, dimension (M)
!>
```

*RESID*

```
!>          RESID is REAL
!>          norm(L*U - A) / ( N * norm(A) * EPS )
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **105** of file **sget01.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.