---
name: "sget40.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/sget40.f"
---

# sget40.f(3)

## NAME

TESTING/EIG/sget40.f

## SYNOPSIS

### Functions/Subroutines

subroutine **sget40** (rmax, lmax, ninfo, knt, nin)\
 **SGET40**

## Function/Subroutine Documentation

### subroutine sget40 (real rmax, integer lmax, integer, dimension( 2 ) ninfo, integer knt, integer nin)

**SGET40**

**Purpose:**

```
!>
!> SGET40 tests STGEXC, a routine for swapping adjacent blocks (either
!> 1 by 1 or 2 by 2) on the diagonal of a pencil in real generalized Schur form.
!> Thus, STGEXC computes an orthogonal matrices Q and Z such that
!>
!>     Q' * ( [ A B ], [ D E ] ) * Z  = ( [ C1 B1 ], [ F1 E1 ] )
!>          ( [ 0 C ]  [   F ] )        ( [ 0  A1 ]  [    D1]  )
!>
!> where (C1,F1) is similar to (C,F) and (A1,D1) is similar to (A,D).
!> Both (A,D) and (C,F) are assumed to be in standard form
!> and (A1,D1) and (C1,F1) are returned with the
!> same properties.
!>
```

**Parameters**

*RMAX*

```
!>          RMAX is REAL
!>          Value of the largest test ratio.
!>
```

*LMAX*

```
!>          LMAX is INTEGER
!>          Example number where largest test ratio achieved.
!>
```

*NINFO*

```
!>          NINFO is INTEGER array, dimension (2)
!>          NINFO( 1 ) = STGEXC without accumulation returned INFO nonzero
!>          NINFO( 2 ) = STGEXC with accumulation returned INFO nonzero
!>
```

*KNT*

```
!>          KNT is INTEGER
!>          Total number of examples tested.
!>
```

*NIN*

```
!>          NIN is INTEGER
!>          Input logical unit number.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **84** of file **sget40.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.