/**
	 * Test for equality up to a given precision.
	 * <p>
	 * The precision argument sets how many digits of precision after the
	 * decimal to consider.
	 * 
	 * @param c
	 *            the Complex to compare for equality.
	 * @param precision
	 *            the number of digits of precsion to use.
	 * @return true if this Complex is equal (within precision) to the argument,
	 *         false otherwise.
	 */
	public boolean equals(Complex c, int precision) {
		double mult = Math.pow(10, precision);
		double precRe = ((int) (re * mult)) / mult;
		double precIm = ((int) (im * mult)) / mult;
		double parPrecRe = ((int) (c.getRe() * mult)) / mult;
		double parPrecIm = ((int) (c.getIm() * mult)) / mult;
		if (precRe != parPrecRe)
			return false;
		if (precIm != parPrecIm)
			return false;
		return true;
	}