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Model : animal1
Simile version : 3.1+
Date added : 2003-06-20
Keywords :
Individual-based ;
Population dynamics ;
Movement ;
This models the dynamics of a population of animals, represented as a set of individuals that come into existence, live for a while, then die. When the animals are alive, they move around according to a simple random walk.
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Equations in Desktop N = sum({one}) Equations in ANIMAL X: initial value = rand(30,70) Y: initial value = rand(30,70) Dir: initial value = rand(0,6.28) create = 100 r = rand(0,2*0.7) m = 0.6 xchange = (if outside == 1 then speed*cos(dir+3.14) else speed*cos(dir)) dirchange = (if outside == 1 then 3.14/dt(1) else rand(-0.4,0.4)/dt(1)) ychange = (if outside == 1 then speed*sin(dir+3.14) else speed*sin(dir)) speed = 5 size = 3 outside = (if (x<0;x>100;y<0;y>100)then 1 else 0) one = 1
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