private boolean matrixDifferencesSmallerThanEpsilon() {
boolean areAllSmallerThanEpsilon = true;
for (int p = 0; p < numberOfPoints; p++) {
for (int c = 0; c < numberOfClusters; c++) {
double prev = prevMembershipMatrix.get(p, c);
double curr = membershipMatrix.get(p, c);
if (Math.abs(curr - prev) > epsilon) {
areAllSmallerThanEpsilon = false;
break;
}
}
}
return areAllSmallerThanEpsilon;
}
private Centroid calculateCentroidOfIndex(int index) {
double[] values = new double[pointsDimensions];
double nominator, denominator;
for (int dim = 0; dim < pointsDimensions; dim++) {
nominator = 0;
denominator = 0;
for (int i = 0; i < numberOfPoints; i++) {
nominator +=
Math.pow(membershipMatrix.get(i, index), fuzziness) * points.get(i).getDim(dim);
denominator += Math.pow(membershipMatrix.get(i, index), fuzziness);
}
values[dim] = nominator / denominator;
}
return new Centroid(values);
}