数据类型如下,怎么取从第一个Cycle=1开始,第二个日期距离Cycle=1的日期,两个日期是80-100之间的对应的不同W值出来,并算出两个W的差值?每一个Person对应有一个W的变化值(问题就是每个差值的W可能在不用的cycle,所以没办法固定的筛选出来cycle=5或者cycle=6然后再计算)。。。R里边对应的功能是什么求助大佬
数据如下,谢谢大佬们
| Person | W | Cycle | Date of W | Start date of cycle |
1 | 60 | 0 | | |
1 | 60 | 1 | 2007/1/29 | 2007/1/29 |
1 | 60 | 2 | 2007/2/12 | 2007/2/12 |
1 | 60 | 3 | 2007/2/26 | 2007/2/26 |
1 | 60 | 4 | 2007/3/19 | 2007/3/19 |
1 | 60 | 5 | 2007/4/2 | 2007/4/2 |
1 | 60 | 6 | 2007/4/16 | 2007/4/16 |
2 | 70 | 0 | | |
2 | 70 | 1 | 2007/1/22 | 2007/1/26 |
2 | 69 | 2 | 2007/2/9 | 2007/2/9 |
2 | | 3 | | 2007/2/23 |
2 | 70 | 4 | 2007/3/8 | 2007/3/9 |
2 | 70 | 5 | 2007/3/23 | 2007/3/23 |
2 | 70 | 6 | 2007/4/5 | 2007/4/5 |
2 | 70 | 7 | 2007/4/18 | 2007/4/20 |
2 | 70 | 8 | 2007/5/4 | 2007/5/4 |
2 | 70 | 9 | 2007/5/18 | 2007/5/18 |
2 | 70 | 10 | 2007/5/31 | 2007/5/31 |
2 | 72 | 11 | 2007/6/14 | 2007/6/14 |
3 | 69 | 0 | | |
3 | 69 | 1 | 2007/1/25 | 2007/1/25 |
3 | 69 | 2 | 2007/2/7 | 2007/2/8 |
3 | 69 | 3 | 2007/2/22 | 2007/2/23 |
3 | 67 | 4 | 2007/3/8 | 2007/3/9 |
3 | 67 | 5 | 2007/3/23 | 2007/3/23 |
3 | 67 | 6 | 2007/4/4 | 2007/4/5 |
3 | 67 | 7 | 2007/4/18 | 2007/4/19 |
3 | 67 | 8 | 2007/5/3 | 2007/5/3 |
3 | 67 | 9 | 2007/5/18 | 2007/5/18 |
3 | 67 | 10 | 2007/5/31 | 2007/5/31 |
3 | 67 | 11 | 2007/6/14 | 2007/6/14 |
3 | 67 | 12 | 2007/6/27 | 2007/6/28 |
3 | 70 | 13 | 2007/7/12 | 2007/7/12 |
3 | 70 | 14 | 2007/7/26 | 2007/7/26 |
3 | 70 | 15 | 2007/8/9 | 2007/8/9 |