Epidemiology: The SEIR model: Difference between revisions

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function turtleMove(turtle,dx,dy) {
function turtleMove(turtle,dx,dy) {
   //turtle.MoveTo([dx+turtle.pos[0],dy+turtle.pos[1]]);
   turtle.MoveTo([dx+turtle.pos[0],dy+turtle.pos[1]]);
  turtle.lookTo([1.0+turtle.pos[0],dy+turtle.pos[1]]);
  turtle.fd(dx*Math.sqrt(1+dy*dy));
}
}
              
              
function loop() {
function loop() {
   var dS = mu.Value()*(1-S.pos[1])-beta*I.pos[1]*S.pos[1];  
   var dS = /*mu.Value()*(1-S.pos[1])*/-beta*I.pos[1]*S.pos[1];  
   var dE = beta*I.pos[1]*S.pos[1]-(mu.Value()+a.Value())*E.pos[1];
   var dE = beta*I.pos[1]*S.pos[1]-(mu.Value()+a.Value())*E.pos[1];
   var dI = a.Value()*E.pos[1]-(gamma.Value()+mu.Value())*I.pos[1];
   var dI = /*a.Value()*E.pos[1]*/-(gamma.Value()+mu.Value())*I.pos[1];
   var dR = gamma.Value()*I.pos[1]-mu.Value()*R.pos[1];
   var dR = gamma.Value()*I.pos[1]/*-mu.Value()*R.pos[1]*/;
   turtleMove(S,delta,dS);
   turtleMove(S,delta,dS);
  turtleMove(E,delta,dE);
//  turtleMove(E,delta,dE);
   turtleMove(I,delta,dI);
   turtleMove(I,delta,dI);
   turtleMove(R,delta,dR);
   turtleMove(R,delta,dR);

Revision as of 07:51, 27 April 2009

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