Contents

Simulator

   help covid19

  Epidemic simulation.
  Inspired by Washington Post graphic by Harry Stevens, March 14, 2020.
  https://www.washingtonpost.com/graphics/2020/world/corona-simulator/?itid=sf_
 
  These are the four types of individuals.
 
  * Mobile.   Susceptible, on the move.
              Blue (or green) circle, O.
  * Static.   Susceptible, stay at home.
              Smaller, darker blue circle, o.
  * Infected. Infects other susceptible individuals within distance "radius".
              Red-orange asterisk, *.
  * Immune.   Was infected for "duration" steps.  No longer infectious.
              Darker red x.
 
  These are the seven controllable parameters, with their starting values.
 
    n = 50;            population size
    infected = .10;    initial infected fraction
    static = .20;      static fraction
    radius = .03;      infectious distance
    duration = 200;    time of infection
    speed = .03;       speed of propagation
    barrier = .80;     barrier height
 
  The epidemic starts in the upper right quadrant.
  The epidemic ends when all infected individuals have become immune.

    Folders named covid19

       Desktop\covid19

Animation

First frame

The animation begins with 5 infections in the upper right quadrant. There are 45 unaffected.

Final frame

The animation ends when there is no more infection. Three individuals have never been infected.

Full barrier

Final frame with complete barrier. Left half is not infected.

No barrier

One individual is never infected.

Larger population

Everybody is eventually infected, and in fewer time steps.

Smaller population

Less infection.

Software

The code is one of the experiments in version 5.0 of Cleve_Lab on the MATLAB Central File Exchange, available here.

The code is on the File Exchange by itself, available here.

Get the MATLAB code

Published with MATLAB® R2019b