/sci/ - Science & Math

I'm running a 10s simulation of a spinning top and trying to find the time period of the oscillation by plotting the center of mass x and z-position.
Its almost entirely consistent from t=1.5s, but before that, the max and min amplitudes have a kind of zig zag spike before continuing with the consistent slope. pic related, top graph shows the first 2 seconds with the spikes, bottom shows first 4 seconds with consistent period.
I think this is how the program approximates the results, but I'm not sure. Did I fuck up somewhere along the way?