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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.


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. is also available to help you with the LAPACK library.


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".


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.