reachstats.py 文件源码

def print_timing_analysis(self):
        border = 10
        if len(self.anoto_timing) < 2 * border:
            return False
        analyze_window = len(self.anoto_timing) - border
        stamps = self.anoto_timing[border:analyze_window]
        deltas = []
        for i in range(len(stamps) - 1, 2, -1):
            deltas.append(stamps[i] - stamps[i - 1])
        print ('Total of this many anoto events: {}'
               .format(len(self.anoto_timing)))
        print ('Number of all deltas {}'.format(len(deltas)))
        deltas = [d for d in deltas if d > 0.009]
        print ('Number of filtered deltas {}'.format(len(deltas)))

        # filter out pen ups
        deltas = [d for d in deltas if d < 0.5]
        freq = 1 / np.average(deltas)
        print ('Anoto sample frequency was: {0:.2f} Hz'
               .format(freq))
        print ('StdDev of delays is {0:.3f} seconds'
               .format(np.std(deltas)))
        self.anoto_timing = []