     generates a discrete colored noise vector of size N with power 
          spectrum distribution of ALPHA.
          White noise is sampled from a uniform distribution
          with range (-R,+R).
        </li>
        <li>
          <a href = "freq_plotter.m">freq_plotter.m</a>, 
          performs a numerical test on the frequency distribution of
          discrete approximations to a continuous noise field.
        </li>
        <li>
          <a href = "timestamp.m">timestamp.m</a>, 
          prin