code: def sample_many(self, num_samples = 2000):
               
          x = []
          y = []
          fix = []
          sample = []
          
          # XXX: Delete ProgressBar
          pbar = ProgressBar(widgets=[Percentage(),Bar()], maxval=num_samples).start()
          
          for s in range(0, num_samples):
              for i, (xs, ys) in enumerate(self.sample()):
                  x.append(xs)
                  y.append(ys)
                  fix.append(i+1)
                  sample.append(s)
              pbar.update(s+1)
              
          fields = {'fix':np.array(fix), 'y':np.array(y), 'x':np.array(x)}
          param = {'pixels_per_degree':self.fm.pixels_per_degree}
          out =  fixmat.VectorFixmatFactory(fields, param)
          return out
docs: Generates a given number of trajectories, using the method sample(). 
          Returns a fixmat with the generated data.
          
          Parameters:
              num_samples : int, optional
                  The number of trajectories that shall be generated.