---
name: "derred.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/derred.f"
---

# derred.f(3)

## NAME

TESTING/EIG/derred.f

## SYNOPSIS

### Functions/Subroutines

subroutine **derred** (path, nunit)\
 **DERRED**

## Function/Subroutine Documentation

### subroutine derred (character\*3 path, integer nunit)

**DERRED**

**Purpose:**

```
!>
!> DERRED tests the error exits for the eigenvalue driver routines for
!> DOUBLE PRECISION matrices:
!>
!> PATH  driver   description
!> ----  ------   -----------
!> SEV   DGEEV    find eigenvalues/eigenvectors for nonsymmetric A
!> SES   DGEES    find eigenvalues/Schur form for nonsymmetric A
!> SVX   DGEEVX   SGEEV + balancing and condition estimation
!> SSX   DGEESX   SGEES + balancing and condition estimation
!> DBD   DGESVD   compute SVD of an M-by-N matrix A
!>       DGESDD   compute SVD of an M-by-N matrix A (by divide and
!>                conquer)
!>       DGEJSV   compute SVD of an M-by-N matrix A where M >= N
!>       DGESVDX  compute SVD of an M-by-N matrix A(by bisection
!>                and inverse iteration)
!>       DGESVDQ  compute SVD of an M-by-N matrix A(with a
!>                QR-Preconditioned )
!>
```

**Parameters**

*PATH*

```
!>          PATH is CHARACTER*3
!>          The LAPACK path name for the routines to be tested.
!>
```

*NUNIT*

```
!>          NUNIT is INTEGER
!>          The unit number for output.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **69** of file **derred.f**.

## Author

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