Walter Wallace Jr.'s Family Does Not Want Police Officers To Face Murder Charges

The killing of Walter Wallace Jr., a Black man in the midst of a psychological episode, by police on Monday has sparked days of protests. The family, who reviewed police bodycam video of the fatal shooting on Thursday morning, is calling for the recordings to be released to the public.

"Here's why: they were improperly trained and did not have the proper equipment by which to effectuate their job," the family's attorney said on Thursday. The officers' names have not been released.

(Image credit: Matt Slocum/AP)

News : NPR https://ift.tt/2HNL2wT October 30, 2020 at 06:38AM

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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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