On Tuesday, Deputy Mayor Alicia Glen appeared on CNBC’s “Squawk Box” to push back against the Amazon backlash. “New York City is a notorious city of people with a lot of opinions,” Glen said, stressing that while there would be more “community engagement,” the City and the State were moving forward with their plan to give one of the world’s most powerful corporations around $3 billion in tax breaks to bring as many as 40,000 jobs to Long Island City. "I can guarantee you five years from now all New Yorkers will be thanking us for having brought them," Glen said. “This deal is not gonna get stopped.” [ more › ] Gothamist https://ift.tt/2Axwlqg November 30, 2018 at 08:00PM
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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