filament particle animation (type error)

[supersybren]

Hello,

I am studying the behaviour of filaments in a fluid where the filament is approximated by a number of interconnected beads. For eacht timestep I got a text file containing coordinates from the simulating c-program. What I want to do now is visualize it using flash+AS3. I want to use AS3 to read coordinate datafiles I have, and to use these coordinates to create an animation in flash.

This is what I have, although I get a 'type error' when I run it.

TypeError: Error #1010: A term is undefined and has no properties.
at display_fla::MainTimeline/frame1()

I define my multidimensional coordinate arrays and the URLLoader.

var loader:URLLoader = new URLLoader();
var xpos:Array = new Array();
var ypos:Array = new Array();

I push the one dimensional array onto my multidimensional array.

loader.dataFormat = URLLoaderDataFormat.VARIABLES;
loader.addEventListener(Event.COMPLETE, loading);
function loading (event:Event):void {
xpos.push(loader.data.xpositions.split(","));
ypos.push(loader.data.ypositions.split(","));
}

Here I call the loading function for each file I have (in this case onle test0.txt and test1.txt, later there will be much more).

for (var j:Number = 0; j < 2; j++){
loader.load(new URLRequest("test"+j+".txt"));
}

So far I think I have created two multidimensional arrays, one for x versus the timestep and one for y versus the time step. Now I want to add MovieClips (of the bead) and move them around the screen according to the coordinate arrays.

I make an array of movieclips (for testing I had restricted to just 10 beads)

var bead_:Array = new Array();

//add enough beads
for (var n:Number = 0; n < 10; n++) {
bead_[n] = new bead();
addChild(bead_[n]);
    }

In this loop I intend to continuously change the positions of the beads on screen to create an animation, however, it's not working yet.

//move around
for (var k:Number = 0; k < 2; k++){
for (var i:Number = 0; i < 3; i++) {
bead_[i].x = xpos[k][i];
bead_[i].y = ypos[k][i];
    }
}

Thanks for any help!