Beware the red peril: Indonesia still fighting ghosts of communism

National paranoia resurfaces for anniversary of failed 1965 coup, with anti-communist film revived and mobs rallying against invisible threat

Beware the evil communists, warn fearful hoax messages spreading on WhatsApp. Should people come to your village offering free blood tests, they are really trying to infect you with HIV.

In some circles in Indonesia it is like the cold war never ended. Even the military is on board with a paranoid campaign against the old red peril.

Continue reading...The Guardian http://ift.tt/2g0wvwW October 01, 2017 at 05:30AM

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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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