def batch_4(dataset):
     # calculate more useful states
     for k, trajec in dataset.trajecs.iteritems():
         print 'batch_4: ', k
         tac.calc_heading(trajec)
         tas.calc_post_dynamics_for_flydra_trajectory(trajec)
         tac.calc_saccades(trajec, threshold_lo=300.)
def calc_saccades_for_dataset(dataset):
    
    for key, trajec in dataset.trajecs.items():
        tac.calc_heading(trajec)
        tac.calc_saccades(trajec)