Inputs: event = {event1, event2, …, eventn}―An event sequence corresponding to movements within a period.

gT―A predetermined threshold.

Outputs: S―Spatial pattern of the event sequence.

score―The score that an event sequence obtains.

Process.

1. event = {event1}

2. score←0

3. S←f

4. for i = 2 to n do

5. if gi ≤ gT then

6. event←event U eventi

7. score←score + 1/gi//gi = ti − ti?1

8. S←S U Spatial_Wand (event)

9. endif

10. endfor