Plot_positions Demo

Set demo parameters:

The current data file represents the collapse of an initially cold (v = 0) sphere containing 2048 point particles interacting only via gravity. It contains 80 frames, uniformly sampled over the range t = [0,10] (delta t = 0.125).

        first frame
        last frame
        show every n-th frame
        x plot limits [low:high]
        y plot limits [low:high]

        tile output on a 3x4 grid
        autoscale each plot