| x | ln x |
|---|---|
| 0 | 未定義 |
| 0 + | -∞ |
| 0.0001 | -9.210340 |
| 0.001 | -6.907755 |
| 0.01 | -4.605170 |
| 0.1 | -2.302585 |
| 1 | 0 |
| 2 | 0.693147 |
| Ë ≈2.7183 | 1 |
| 3 | 1.098612 |
| 4 | 1.386294 |
| 5 | 1.609438 |
| 6 | 1.791759 |
| 7 | 1.945910 |
| 8 | 2.079442 |
| 9 | 2.197225 |
| 10 | 2.302585 |
| 20 | 2.995732 |
| 30 | 3.401197 |
| 40 | 3.688879 |
| 50 | 3.912023 |
| 60 | 4.094345 |
| 70 | 4.248495 |
| 80 | 4.382027 |
| 90 | 4.499810 |
| 100 | 4.605170 |
| 200 | 5.298317 |
| 300 | 5.703782 |
| 400 | 5.991465 |
| 500 | 6.214608 |
| 600 | 6.396930 |
| 700 | 6.551080 |
| 800 | 6.684612 |
| 900 | 6.802395 |
| 1000 | 6.907755 |
| 10000 | 9.210340 |