Marlins Name Kim Ng MLB's First Female General Manager

Kim Ng, seen earlier this year, will be the first woman to lead a Major League Baseball team, the Miami Marlins.

She is leaving her senior vice president position at Major League Baseball to join the Miami team. Over all, Ng has three decades of baseball experience.

(Image credit: Marcelo Maragni/MLB Photos via Getty Images)

News : NPR https://ift.tt/32L8aDD November 14, 2020 at 03:36AM

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Solving Van der Pol equation with ivp_solve

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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