gistfile1.js

function toIndice(vec, graph_width) {
    return ((vec.y) * graph_width + vec.x);
}

function allUnique(array) {
    var uniques = _.uniq(array);

    return array.length === uniques.length;
};

var graph_width = 23;
var vectors = [];
var indices = [];

var i, vectors = [], indices = [];
for (i = 0; i < 5000; i += 1) {
    vectors.push(new Vector(0, 0, 0));
}

var j;
for (j = 0; j < vectors.length; j += 1) {

    vectors[j].y = j;

    var k;
    for (k = 0; k < graph_width; k+= 1) {
        vectors[j].x = k;
        indices.push(toIndice(vectors[j], graph_width));
    }

    k = 0;
}

console.log(allUnique(indices));
=> true