file lyapack/lyapack.tar.gz for the solution of certain large scall problems in control theory, , which are closely related to Lyapunov equations. LYAPACK uses , iterative algorithms and is intended for large, sparse problems. by Thilo Penzl lang Matlab file lyapack/README for short introduction to LYAPACK file lyapack/guide.ps for user's guide for LYAPACK in PostScript format file lyapack/guide.pdf for user's guide for LYAPACK in PDF format .