private void validate() throws RrdException {
		boolean ok = true;
		if(timestamps.length != values.length || timestamps.length < 2) {
			ok = false;
		}
		for(int i = 0; i < timestamps.length - 1 && ok; i++) {
			if(timestamps[i] >= timestamps[i + 1]) {
				ok = false;
			}
		}
		if(!ok) {
			throw new RrdException("Invalid plottable data supplied");
		}
	}