class BLAS {

	public static double dot(double[] x, double[] y) {
		Preconditions.checkArgument(x.length == y.length, "Array dimension mismatched.");
		double s = 0.;
		for (int i = 0; i < x.length; i++) {
			s += x[i] * y[i];
		}
		return s;
	}

}