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5

This model is implemented using Julia's DifferentialEquations.jl in this tutorial. Here's a version of that code: using DifferentialEquations using StochasticDiffEq using DiffEqCallbacks using Random using SparseArrays using DataFrames using StatsPlots using BenchmarkTools function sir_ode!(du,u,p,t) (S,I,R) = u (β,c,γ) = p N = S+I+R @...


5

It means that the method will be stable only if certain criteria are meet. For explicit methods this means that the time-step must be lower than a certain value set by the mesh spacing and diffusion constant. There's a fair bit of analysis that I'm stepping over but you'll end up with a CFL (Courant-Friedrichs-Lewy)-like condition: $\Delta t \le \frac{\Delta ...


1

In summary: it is wrong to use the phase angle of the periapsis also as the offset for the mean anomaly. Both transformations, mean to eccentric anomaly, and eccentric anomaly to true anomaly (and to the angle in the original coordinate system) are non-linear. I'll first run my Python "standard program" to compute the orbit geometry. I use the ...


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