Uniform Distribution refine

uniformdistribution.java

/**
	 * Performs an intersection with another Uniform Distribution and updates this one in place
	 * The idea is that improves the accuracy of the current UD
	 *
	 * @param a the UniformDistribution to refine this one with
	 *
	 * @return boolean indicating if this UD was improved
	 *
	 * @throws ArithmeticException if there was no overlap between the two UD
	 */
	public boolean refine (UniformDistribution a) throws ArithmeticException { 

		// sanity check

		boolean changed = false;
		if ((upper > a.getUpper() || upper > a.getLower()) && ( lower < a.getLower() || lower < a.getUpper())) 
		{

			if (lower < a.getLower())
			{
				double d = a.getLower() - lower;
				//System.err.println("lower diff: " + d + "/" + lower);
				lower=a.getLower();
				changed=true;
			}

			if (upper > a.getUpper())
			{
				double d = upper - a.getUpper();
				//System.err.println("upper diff: " + d +  "/" + upper + " : " + lower);
				upper=a.getUpper();
				changed=true;
			}
		} else {
			throw new ArithmeticException( "REFINE Sanity check Exception : " + toString() + " x " + a);
		}
		return changed;
	}