"Let's bring it back to the SOB days," Travis Scott said a few songs into his musical concert-slash-traveling circus-slash-performative Instagram experience at Madison Square Garden on Wednesday night. Hmm, I might be misremembering things, but I don't recall seeing huge fireballs, makeshift rollercoasters, and frantic laser light shows the last time I stopped by the humble Varick Street music venue. But those are all crowd-pleasing elements of Scott's massive "ASTROWORLD: Wish You Were Here" tour, which blazed through NYC this week for two shows made up of the most impressive hip hop pageantry this side of Drake's flying Ferrari. [ more › ] Gothamist https://ift.tt/2TZV8vS November 29, 2018 at 10:39PM
Van der Pol’s differential equation is The equation describes a system with nonlinear damping, the degree of damping given by μ. If μ = 0 the system is linear and undamped, but for positive μ the system is nonlinear and damped. We will plot the phase portrait for the solution to Van der Pol’s equation in Python using SciPy’s new ODE solver ivp_solve . The function ivp_solve does not solve second-order systems of equations directly. It solves systems of first-order equations, but a second-order differential equation can be recast as a pair of first-order equations by introducing the first derivative as a new variable. Since y is the derivative of x , the phase portrait is just the plot of ( x , y ). If μ = 0, we have a simple harmonic oscillator and the phase portrait is simply a circle. For larger values of μ the solutions enter limiting cycles, but the cycles are more complicated than just circles. Here’s the Python code that made the plot. from scipy import linspace from ...
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