% Descriptor System and Rational Matrix Manipulation Toolbox.
% Version 1.04c   15-March-2004
%
% What's new.
%   readme      - New features and enhancements in this version.
%   readme_plan - Planned new features and enhancements.
%
% Conversions.
%   dss2zpk     - Conversion to zero/pole/gain.
%   dss2tm      - Conversion to transfer function matrix.
%   tm2dss      - Conversion to state space of rational matrices.
%   dss2ss      - Conversion to standard state space.
%
% Operations on rational matrices/LTI systems.
%   sconj       - Conjugate transpose of an LTI system.
%   sinv        - Inverse/generalized inverse of an LTI system.
%   slrinv      - Least order right/left inverses
%   spinv       - Pseudo-inverses of a rational/LTI system.
%   srank       - Normal rank of transfer-function matrices.
%   snrcf       - Normalized right coprime factorization.
%   snlcf       - Normalized left coprime factorization.
%   snull       - Nullspace basis of a rational matrix
%   srsol       - Solution of linear rational equations.
%   siofac      - Inner-outer factorization.
%   sqrfac      - QR-factorization of rational matrices   
%   sdec        - Additive spectral decompositions.
%   smcover2    - Minimum dynamic cover based order reduction of proper systems.
%
% Model dynamics analysis.
%   spole       - System poles and Kronecker structure of pole pencil.
%   szero       - System zeros and Kronecker structure of system pencil.
%   seig        - Eigenvalues and Kronecker structure of pole pencil.
%   kronscf     - Kronecker-like staircase form of an arbitrary pencil.
%
% State-space transformations.
%   dsqr,dsrq   - QR/RQ coordinate forms.
%   dssvd       - SVD and SVD-like coordinate forms.
%   dsgrsf      - ordered generalized Schur-coordinate forms.
%   dsghess     - generalized Hessenberg-coordinate forms.
%   dsctrbf     - Descriptor controllability forms.
%   dsobsvf     - Descriptor observability forms.
%   dsbal       - Diagonal balancing of descriptor realizations.  
%   dsminreal   - Minimal realization of descriptor systems.
%   dss2dss     - Descriptor system similarity transformation.
%
% Model reduction.
%   gbta        - Generalized balanced truncation approximation.
%
% Design tools.
%   gplace      - Generalized eigenvalue assignment.
%   gstab       - Generalized stabilization.
%
% Linear matrix equation solvers.
%   glyap       - Solve generalized continuous Lyapunov equations.
%   gdlyap      - Solve generalized discrete Lyapunov equations.
%   gplyap      - Solve generalized positive continuous Lyapunov equations.
%   gpdlyap     - Solve generalized positive discrete Lyapunov equations.
%   gsylv       - Solve generalized Sylvester equation.
%   gsylvs      - Solve generalized Sylvester system.
%
% Basic mex functions.
%   gsystr      - Generalized system similarity transformations.
%   gsminr      - Generalized system minimal realization.
%   gssep       - Descriptor system spectral separations.
%   gszero      - Generalized system zeros and Kronecker structure.
%   qzord       - QZ-algorithm and stable/unstable ordering of
%                 generalized eigenvalues.
%   kstair      - Staircase reduction of a pencil.
%   sysplace    - Partial pole placement using the Schur method.
%   glinmeq     - Generalized linear matrix equations.
%
% Installation
%   desc_install- Help file for installation of the toolbox.
%   desc_check  - Check installation
%   
% Demo
%   desc_demo   - Illustration of basic handling capabilities