private boolean compareMean(float[] a, float[] b) {
		if (a.length != b.length)
			return false;
		for (int i = 0; i < a.length; i++) {
			if (a[i] > 0 && b[i] > 0 && a[i] != b[i]) {
				return false;
			}
		}
		return true;
	}