I tried another visualization of eigenvalues depending on types of matrices. Just started, will be updated.
Map of eigenvalues
Board Member of Scrum Inc, Japan(Tokyo) Founder & CTO of Change Vision, Inc., an ISV of Astah (Tokyo) CEO of ESM, Inc. (Fukui) Founder of Agile Japan , based in Japan. Recent articles includes "Kanban Applied to Software Development: from Agile to Lean". Co-translated several Agile books into Japanese including: "Lean Software Development," "XP Installed", "Agile Project Management." 2008 Gordon Pask Award recipient for contributions to Agile practice.