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This repository contains a document describing the proposed Particle Stream Data Format (PSDF) for N-Body simulations and associated code in several different programming languages. PSDF is optimized for recording the output of general N-Body simulations that exploit individual timesteps, and is based on the well-known YAML (http://yaml.org) format for representing data. * The "data-format" directory contains a paper and LaTeX sources describing PSDF. * The "examples" directory contains examples of the use of PSDF in various languages; the "examples/data" subdirectory contains some sample PSDF streams. You may be interested in - The C example in "examples/C" demonstrating how to use libyaml to parse PSDF into your favorite body structure. - The C# example in "examples/Csharp" demonstrates how to use yamldotnet and C# to read and write PSDF files. - The Fortran example in "examples/Fortran" demonstrating how to use the C library to read and write PSDF from Fortran. - The Haskell example in "examples/Haskell" demonstrates how to read and write PSDF files using Haskell. - The Java example in "examples/Java" shows how to use SnakeYAML and Java to read and write PSDF files. - The Python examples in "examples/Python", which contain several routines to generate initial conditions for point-mass simulations in PSDF format, various post-processing tools, and a complete individual-timestep integrator that uses PSDF based on the Hermite scheme. - The Ruby examples in "examples/ruby", which contain a PSDF-based Open GL viewer, "testplot.rb" that consumes a PSDF stream and displays a movie of the corresponding N-Body system.