Random walks: Difference between revisions

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<source lang="html4strict">
<source lang="html4strict">
<jsxgraph width="600" height="600">
<jsxgraph width="600" height="600">
var brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 300, originY: 300, unitX: 3, unitY: 3});
var t = brd.createElement('turtle');
function run() {
  var i,j,dist,sumdist=0.0;
  var stepSize = 5;
  brd.suspendUpdate();
  var nr = $('number').value*1;
  for (i=0;i<nr;i++) {
    for (j=0;j<100;j++) {
        var a = Math.floor(360*Math.random());
        t.right(a);
        t.forward(stepSize);
    }
    dist = t.pos[0]*t.pos[0]+t.pos[1]*t.pos[1];
    sumdist += dist;
    t.home();
  }
  $('output').value = (sumdist/nr).toFixed(3);
  brd.unsuspendUpdate();
}
function clearturtle() {
  sumist = 0.0
  t.cs();
}
</jsxgraph>
</jsxgraph>
</source>
</source>


===External links===
===External links===
* []
* [http://en.wikipedia.org/wiki/Random_walk http://en.wikipedia.org/wiki/Random_walk]


[[Category:Examples]]
[[Category:Examples]]
[[Category:Turtle Graphics]]
[[Category:Turtle Graphics]]

Revision as of 18:30, 26 May 2009

Number of random walks:

Average square length of the walks:

Source code

<jsxgraph width="600" height="600">
var brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 300, originY: 300, unitX: 3, unitY: 3});
var t = brd.createElement('turtle');

function run() {
  var i,j,dist,sumdist=0.0;
  var stepSize = 5; 
  brd.suspendUpdate();
  var nr = $('number').value*1;
  for (i=0;i<nr;i++) {
     for (j=0;j<100;j++) {
        var a = Math.floor(360*Math.random()); 
        t.right(a); 
        t.forward(stepSize);
     }
     dist = t.pos[0]*t.pos[0]+t.pos[1]*t.pos[1];
     sumdist += dist;
     t.home();
  }
  $('output').value = (sumdist/nr).toFixed(3);
  brd.unsuspendUpdate();
}
function clearturtle() {
  sumist = 0.0
  t.cs();
}
</jsxgraph>

External links