Want To Buy A Gun At Walmart? You've Got To Ask For It

Walmart pulled guns and ammunition from its store shelves as a precautionary measure, following the unrest in Philadelphia this week after police fatally shot a Black man on Monday. The retail giant has taken similar actions in the past, including earlier this year after George Floyd, another Black man, was killed by police in Minneapolis.

The retail giant removed firearms and ammunition from its shelves saying it's a precautionary step amid the recent outbreak of civil unrest. But the weapons are still available, if you ask for them.

(Image credit: Alan Diaz/AP)

News : NPR https://ift.tt/3kHX2hI October 30, 2020 at 04:16AM

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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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