数据集:
+-------------------------------+
| hop sex vname l u |
|-------------------------------|
1. | 1 1 rbc 3 5 |
2. | 1 2 rbc 4 6 |
3. | 1 . wbc . . |
4. | 2 . rbc 3.5 5.5 |
5. | 2 . wbc 4 10 |
+-------------------------------+
得到的数据集
+-------------------------------+
| hop sex vname l u |
|-------------------------------|
1. | 1 1 rbc 3 5 |
2. | 1 2 rbc 4 6 |
3. | 1 1 wbc . . |
4. | 1 2 wbc . . |
5. | 2 1 rbc 3.5 5.5 |
|-------------------------------|
6. | 2 2 rbc 3.5 5.5 |
7. | 2 1 wbc 4 10 |
8. | 2 2 wbc 4 10 |
+-------------------------------+