code: def plot(self, **kargs):
          
          from pylab import plot, linspace, xlabel, ylabel, grid
          time = linspace(1*self.dt, self.N*self.dt, self.N)
          plot(time, self.data, **kargs)
          xlabel('Time')
          ylabel('Amplitude')
          grid(True)
docs: Plot the data set, using the sampling information to set the x-axis
          correctly.