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simulations with Lagrangian method,both symbolic and by numeric deriv
...All well-grouped in folders. there is also a 'review' in 3 demos of the Newtonian dynamics: mass-spring systems. most of progs are written in C, with use of SDL lib to display simple graphics and have real-time interactivity. As to programming complexity, it's very simple... this all aims at classical physics simulation in a simple but efficient way. The numeric stuff really just illustrate the use of a real little physics-engine aimed at articulated body simulation... that's the funnest part of it: but of course much more is coming. Also some examples in Game Maker and Matlab/Octave are coming soon.
link to Part 1 of the video where all method is thoroughly exmplained:
http://youtu.be/ELD0WPOxNb0
http://youtu.be/Kjhkyq-pLLw
the part_2 shall explain numeric stuff, and some support for collisions and serious rigid bodies jointed.
MOPlot - visualization program for fast Molecular Orbitals Plotting (and other stuff - please, read the full description) from the outputs of the Gaussian 09-94, Molcas, Gamess/US, Firefly quantum chemical calculation packages.