The House votes Tuesday on a bill giving prosecutors and victims more power to hold websites accountable for sex trafficking on their platforms. Some companies and digital rights groups oppose it, saying it will chip away at the legal immunity that's a pillar of the Internet. Sen. Rob Portman, R-Ohio, who wrote the Senate version, tells NPR the tech industry is overreacting.
News : NPR http://ift.tt/2BS2v21 February 28, 2018 at 12:03AM
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 ...
Comments
Post a Comment