A quality engineer records pipe diameters in separate columns for each week, along with the machine that produced them. The engineer wants to combine all diameters into a single column with a corresponding machine column.
Week 1, Week 2, Week 3, and Machine contain the unstacked data. The stacked data are in Diameter and Machine Number. The corresponding IDs are in ID.
| C1 | C2 | C3 | C4 | ... | C6 | C7 | C8-T |
|---|---|---|---|---|---|---|---|
| Week 1 | Week 2 | Week 3 | Machine | ... | Diameter | Machine Number | ID |
| 5.19 | 5.57 | 8.73 | 1 | ... | 5.19 | 1 | Week 1 |
| 5.53 | 5.11 | 5.01 | 2 | ... | 5.53 | 2 | Week 1 |
| 4.78 | 5.76 | 7.59 | 1 | ... | 4.78 | 1 | Week 1 |
| 5.44 | 5.65 | 4.73 | 2 | ... | 5.44 | 2 | Week 1 |
| 4.47 | 4.99 | 4.93 | 1 | ... | 4.47 | 1 | Week 1 |
| 4.78 | 5.25 | 5.19 | 2 | ... | 4.78 | 2 | Week 1 |
| 4.25 | 7.00 | 6.77 | 1 | ... | 4.25 | 1 | Week 1 |
| 5.70 | 5.20 | 5.66 | 2 | ... | 5.70 | 2 | Week 1 |
| 4.40 | 5.30 | 6.48 | 1 | ... | 4.40 | 1 | Week 1 |
| 5.64 | 4.91 | 5.20 | 2 | ... | 5.64 | 2 | Week 1 |
| ... | 5.57 | 1 | Week 2 | ||||
| ... | 5.11 | 2 | Week 2 | ||||
| ... | 5.76 | 1 | Week 2 | ||||
| ... | 5.65 | 2 | Week 2 | ||||
| ... | ... | ... | ... |