Contents

• 0. Preface
• 0.1. Acknowledgments
• 1. A Hierarchical Data Format
• 1.1. Thinking Ahead
• 1.2. Tree Structure
• 1.3. Physical Quantities
• 1.4. A Particle Format
• 1.5. Name Spaces
• 1.6. Compromise
• 1.7. Hierarchical particle structures
• 1.8. Extended Tag Names
• 2. Particle Output
• 2.1. Getting Started
• 2.2. A Single Write Method
• 2.3. Writing to_s
• 2.4. Methods f_to_s and f_v_to_s
• 2.5. Testing
• 2.6. The File iobody1.rb
• 3. Using the to_s Method
• 3.1. xxx
• 4. Nested Output
• 4.1. ACS Output
• 4.2. Nbody Output
• 4.3. Example: Plummer's Model
• 5. Particle Input
• 5.1. How to Read
• 5.2. Passing the Type
• 5.3. Handling the Header
• 5.4. Handling Other Lines
• 5.5. Testing
• 6. A Scratch Pad
• 6.1. Extra Information
• 6.2. Two Possibilities
• 6.3. More Possibilities
• 6.4. A Box
• 6.5. Onward
• 6.6. Testing
• 7. Nested Input
• 7.1. xxx
• 8. Introduction
• 8.1. xxx
• 8.2. xxx
• 9. Literature References