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Update numpy_exercises_for_data_analysis.md #39

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7 changes: 6 additions & 1 deletion docs/article/advanced/numpy_exercises_for_data_analysis.md
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Expand Up @@ -2143,8 +2143,13 @@ a = np.array([1, 3, 7, 1, 2, 6, 0, 1])

```python
a = np.array([1, 3, 7, 1, 2, 6, 0, 1])
#solution1
doublediff = np.diff(np.sign(np.diff(a)))
peak_locations = np.where(doublediff == -2)[0] + 1

#solution2
peak_locations = np.array([i for i in range(1,a.size - 1) if a[i]>a[i-1] and a[i] > a[i+1]])

peak_locations
# > array([2, 5])
```
Expand Down Expand Up @@ -2385,4 +2390,4 @@ print(gen_strides(np.arange(15), stride_len=2, window_len=4))

## 文章出处

由NumPy中文文档翻译，原作者为 machinelearningplus.com，翻译至：[https://www.machinelearningplus.com/python/101-numpy-exercises-python/](https://www.machinelearningplus.com/python/101-numpy-exercises-python/)
由NumPy中文文档翻译，原作者为 machinelearningplus.com，翻译至：[https://www.machinelearningplus.com/python/101-numpy-exercises-python/](https://www.machinelearningplus.com/python/101-numpy-exercises-python/)