file carex_f.tgz for generation of examples of continuous-time algebraic Riccati equations by Benner, Laub, and Mehrmann prec double lang fortran gams D8, F2, G3, G4a file darex_f.tgz for generation of examples of discrete-time algebraic Riccati equations by Benner, Laub, and Mehrmann prec double lang fortran gams D8, F2, G3, G4a