---
name: "alahd.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/alahd.f"
---

# alahd.f(3)

## NAME

TESTING/LIN/alahd.f

## SYNOPSIS

### Functions/Subroutines

subroutine **alahd** (iounit, path)\
 **ALAHD**

## Function/Subroutine Documentation

### subroutine alahd (integer iounit, character\*3 path)

**ALAHD**

**Purpose:**

```
!>
!> ALAHD prints header information for the different test paths.
!>
```

**Parameters**

*IOUNIT*

```
!>          IOUNIT is INTEGER
!>          The unit number to which the header information should be
!>          printed.
!>
```

*PATH*

```
!>          PATH is CHARACTER*3
!>          The name of the path for which the header information is to
!>          be printed.  Current paths are
!>             _GE:  General matrices
!>             _GB:  General band
!>             _GT:  General Tridiagonal
!>             _PO:  Symmetric or Hermitian positive definite
!>             _PS:  Symmetric or Hermitian positive semi-definite
!>             _PP:  Symmetric or Hermitian positive definite packed
!>             _PB:  Symmetric or Hermitian positive definite band
!>             _PT:  Symmetric or Hermitian positive definite tridiagonal
!>             _SY:  Symmetric indefinite,
!>                     with partial (Bunch-Kaufman) pivoting
!>             _SR:  Symmetric indefinite,
!>                     with rook (bounded Bunch-Kaufman) pivoting
!>             _SK:  Symmetric indefinite,
!>                     with rook (bounded Bunch-Kaufman) pivoting
!>                     ( new storage format for factors:
!>                       L and diagonal of D is stored in A,
!>                       subdiagonal of D is stored in E )
!>             _SP:  Symmetric indefinite packed,
!>                     with partial (Bunch-Kaufman) pivoting
!>             _HA:  (complex) Hermitian ,
!>                     with Aasen Algorithm
!>             _HE:  (complex) Hermitian indefinite,
!>                     with partial (Bunch-Kaufman) pivoting
!>             _HR:  (complex) Hermitian indefinite,
!>                     with rook (bounded Bunch-Kaufman) pivoting
!>             _HK:  (complex) Hermitian indefinite,
!>                     with rook (bounded Bunch-Kaufman) pivoting
!>                     ( new storage format for factors:
!>                       L and diagonal of D is stored in A,
!>                       subdiagonal of D is stored in E )
!>             _HP:  (complex) Hermitian indefinite packed,
!>                     with partial (Bunch-Kaufman) pivoting
!>             _TR:  Triangular
!>             _TP:  Triangular packed
!>             _TB:  Triangular band
!>             _QR:  QR (general matrices)
!>             _LQ:  LQ (general matrices)
!>             _QL:  QL (general matrices)
!>             _RQ:  RQ (general matrices)
!>             _QP:  QR with column pivoting
!>             _TZ:  Trapezoidal
!>             _LS:  Least Squares driver routines
!>             _LU:  LU variants
!>             _CH:  Cholesky variants
!>             _QS:  QR variants
!>             _QT:  QRT (general matrices)
!>             _QX:  QRT (triangular-pentagonal matrices)
!>             _TS:  QR routines for tall-skinny and short-wide matrices
!>             _HH:  Householder reconstruction for tall-skinny matrices
!>          The first character must be one of S, D, C, or Z (C or Z only
!>          if complex).
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **106** of file **alahd.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.