LAPACK

VERSION 1.0 : February 29, 1992
VERSION 1.0a : June 30, 1992
VERSION 1.0b : October 31, 1992
VERSION 1.1 : March 31, 1993
VERSION 2.0 : September 30, 1994
VERSION 3.0 : June 30, 1999
VERSION 3.0 + update : October 31, 1999
VERSION 3.0 + update : May 31, 2000
VERSION 3.1 : November 2006
VERSION 3.1.1 : February 2007
VERSION 3.2 : November 2008
VERSION 3.2.1 : April 2009
VERSION 3.2.2 : June 2010
VERSION 3.3.0 : November 2010
VERSION 3.3.1 : April 2011
VERSION 3.4.0 : November 2011
VERSION 3.4.1 : April 2012
VERSION 3.4.2 : September 2012
VERSION 3.5.0 : November 2013
VERSION 3.6.0 : November 2015
VERSION 3.6.1 : June 2016
VERSION 3.7.0 : December 2016
VERSION 3.7.1 : June 2017
VERSION 3.8.0 : November 2017
VERSION 3.9.0 : November 2019
VERSION 3.9.1 : April 2021
VERSION 3.10.0 : June 2021
VERSION 3.10.1 : April 2022
VERSION 3.11.0 : November 2022
VERSION 3.12.0 : November 2023
VERSION 3.12.1 : January 2025

LAPACK is a library of Fortran subroutines for solving the most commonly occurring problems in numerical linear algebra.

LAPACK is a freely-available software package. It can be included in commercial software packages (and has been). We only ask that that proper credit be given to the authors, for example by citing the LAPACK Users' Guide. The license used for the software is the modified BSD license.

Like all software, it is copyrighted. It is not trademarked, but we do ask the following: if you modify the source for these routines we ask that you change the name of the routine and comment the changes made to the original.

We will gladly answer any questions regarding the software. If a modification is done, however, it is the responsibility of the person who modified the routine to provide support.

LAPACK is available from GitHub. LAPACK releases are also available on netlib.

The distribution contains (1) the Fortran source for LAPACK, and (2) its testing programs. It also contains (3) the Fortran reference implementation of the Basic Linear Algebra Subprograms (the Level 1, 2, and 3 BLAS) needed by LAPACK. However this code is intended for use only if there is no other implementation of the BLAS already available on your machine; the efficiency of LAPACK depends very much on the efficiency of the BLAS. It also contains (4) CBLAS, a C interface to the BLAS, and (5) LAPACKE, a C interface to LAPACK.

Installation

LAPACK can be installed with make. The configuration must be set in the make.inc file. A make.inc.example for a Linux machine running GNU compilers is given in the main directory. Some specific make.inc are also available in the INSTALL directory.
LAPACK includes also the CMake build. You will need to have CMake installed on your machine. CMake will allow an easy installation on a Windows Machine. An example CMake build to install the LAPACK library under $HOME/.local/lapack/ is:
```
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=$HOME/.local/lapack ..
cmake --build . -j --target install
```
LAPACK can be built and installed using vcpkg dependency manager:
```
git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh  # ./bootstrap-vcpkg.bat for Windows
./vcpkg integrate install
./vcpkg install lapack
```
The lapack port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.

User Support

LAPACK has been thoroughly tested, on many different types of computers. The LAPACK project supports the package in the sense that reports of errors or poor performance will gain immediate attention from the developers. Such reports, descriptions of interesting applications, and other comments should be sent by email to the LAPACK team.

A list of known problems, bugs, and compiler errors for LAPACK is maintained on netlib. Please see as well the GitHub issue tracker.

For further information on LAPACK please read our FAQ and Users' Guide. A user forum and specific information for running LAPACK under Windows are also available to help you with the LAPACK library.

Testing

LAPACK includes a thorough test suite. We recommend that, after compilation, you run the test suite.

For complete information on the LAPACK Testing please consult LAPACK Working Note 41 "Installation Guide for LAPACK".

LAPACKE

LAPACK now includes the LAPACKE package. LAPACKE is a Standard C language API for LAPACK that was born from a collaboration of the LAPACK and INTEL Math Kernel Library teams.

License

lfortran/lapack

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