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All of the code used to make the simulations and graphics in these posts (1, 2, 3) on my blog. Included are implementations of a double-pendulum simulator in the Matlab, Python, and C++ programming languages, along with some 3rd party libraries for graphing help.

git clone
cd Double-Pend-Simulation


Open up Matlab and navigate to the Double-Pendulum-Simulation/matlab/ directory. You will be calling one of the DoublePendSimulation() functions, and passing in 3 arguments, one of them being a vector arugments itself. The 4 arguments are :

  1. IC - Initial conditions vector. ic = [theta1; angvel1; theta2; angvel2; grav; mass1; mass2; len1; len2;]
  2. time - The ending time of the simulation.
  3. simspeed - A factor by which to slow-down the simulation, i.e. 2.0 means twice as slow (2x fps).
DoublePendSimulation3([.849;-.2;-1.35;0.0;9.81;0.9;.7;.6;.4],55,1.0, 2);
DoublePendSimulation4([.75;-.2;-.1.15;0.0;9.81;0.9;.7;.6;.4],35,1.0, 2);


Currently in progress, almost finished with the Runge-Kutta solver, then I can move onto the simulation code.


Have not started yet, check back soon for updates.

Updated : 2015-04-04
Created : 2014-05-21