---
name: "zchkbk.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/zchkbk.f"
---

# zchkbk.f(3)

## NAME

TESTING/EIG/zchkbk.f

## SYNOPSIS

### Functions/Subroutines

subroutine **zchkbk** (nin, nout)\
 **ZCHKBK**

## Function/Subroutine Documentation

### subroutine zchkbk (integer nin, integer nout)

**ZCHKBK**

**Purpose:**

```
!>
!> ZCHKBK tests ZGEBAK, a routine for backward transformation of
!> the computed right or left eigenvectors if the original matrix
!> was preprocessed by balance subroutine ZGEBAL.
!>
```

**Parameters**

*NIN*

```
!>          NIN is INTEGER
!>          The logical unit number for input.  NIN > 0.
!>
```

*NOUT*

```
!>          NOUT is INTEGER
!>          The logical unit number for output.  NOUT > 0.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **54** of file **zchkbk.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.