Dynamic creation of new Vector with Vector of Vectors

Question

All java gurus,
I am trying to write an application that will generate a vector where at each index there is another vector that contains a set of random float values. So, that is where the Vector of Vectors part comes in. I have figured out by multiple trial and error that inevitably I will need to generate (initialize new Vectors) for as many indicies that I want in the larger vector. Is there a way to do this such that I don't have to type so many calls of Vector x = new Vector(); This is overall going to be used in a Neural Network project and I am trying to write a WeightMatrix whereas each index in the large vector WeightMatrix contain another vector of random float values. Here below is some sample code that I tried but I know doesn't work, but maybe it will give you a better idea of what I am trying to do. Please also respond to [email protected]
Vector weightMatrix = new Vector(10);
Vector weights = new Vector(10);
Random rand = new Random();
for (int i=0; i < 10; i++) {
     this.weights.clear();
     for (int j=0; j < 10; j++)
          this.weights.add(j, new Float(this.rand.nextFloat()));
     this.weightMatrix.add(i, this.weights);
}This code is under a class, so the "this" statements are not the problem.
If you need more info or know of a solution, please email me ([email protected]). Thanks in advance!
Keith Pemberton

Answer 1

I figured it out, but this is for future reference for other people that have the same problem. You can use one vector over and over, you just have to set it as a new vector in the 1st for loop. So, you don't need to create tons of individual vectors (ie. Vector1, Vector2, etc...). So, my final code looks like this
Vector weightMatrix = new Vector(10);
Vector weights = new Vector(10);
Random rand = new Random();
for (int i=0; i < 10; i++) {
    this.weights = new Vector(10);
    for (int j=0; j < 10; j++)
        this.weights.add(j, new Float(this.rand.nextFloat()));
    this.weightMatrix.add(i, this.weights);
}Hope this helps anyone out there!
Keith