= Welcome to M.E.S.S. =
MESS, the Matrix Equations Sparse Solvers library, is the successor to the Lyapack Toolbox for MATLAB®. It will be available as a MATLAB® toolbox as well as a C-library. It is intended for solving large sparse matrix equations as well as problems from model order reduction and optimal control. The C-version provides a large set of auxillary subroutines for sparse matrix computations and efficient usage of modern multicore workstations.

== Features == 
At the moment the following features are available or under active development:
 * solving large scale (generalized) Lyapunov and Riccati equations.
 * model order reduction for 1st and 2nd order systems via Balanced Truncation.
 * H_2 model order reduction via the IRKA and TSIA algorithms.
 * tools for LQR problems.
 * Differential Riccati equation solvers. 

The C-library additionally provides: 
 * a uniform interface to handle sparse and dense matrices.
 * shared memory parallel algorithms using OpenMP and Pthreads. 
 * a solver for special sparse-dense Sylvester equations.
 * a large set of direct and iterative solvers for linear systems. 
 * various helper subroutines for thread pools, configuration files, interface to MATLAB, ...



== Contact == 
For information about the MATLAB-part please contact [http://www.mpi-magdeburg.mpg.de/mpcsc/saak/ Dr. Jens Saak]. 

For information about the C-library please contact [http://www.mpi-magdeburg.mpg.de/mpcsc/koehlerm/ Martin Köhler].

== Troubleshooting ==
We are collecting a number of common pitfalls regarding the compilation and usage on a separate [wiki:troubleshooting] page.

== Software Testing == 
The C-library is tested nightly. The results are only available from our institute. See [http://johannes/cdash/].

=== Help using Trac  ===

 * TracGuide --  Built-in Documentation
 * [http://trac.edgewall.org/ The Trac project] -- Trac Open Source Project
 * [http://trac.edgewall.org/wiki/TracFaq Trac FAQ] -- Frequently Asked Questions
 * TracSupport --  Trac Support