# 两个向量是否相近-np.allclose

比较两个向量是否相同直接==就行，但是相近的话就不一样了，当然可以自己实现，这里numpy提供了方法，

官方API:<https://docs.scipy.org/doc/numpy/reference/generated/numpy.allclose.html>

```python
numpy.allclose(a, b, rtol=1e-05, atol=1e-08, equal_nan=False)
```

> a,b两个向量 a,b两个向量 rtol : float The relative tolerance parameter atol : float The absolute tolerance parameter equal\_nan : bool 是否匹配空nan值 return 是否相近

```python
>>> np.allclose([1e10,1e-7], [1.00001e10,1e-8])
False
>>> np.allclose([1e10,1e-8], [1.00001e10,1e-9])
True
>>> np.allclose([1e10,1e-8], [1.0001e10,1e-9])
False
>>> np.allclose([1.0, np.nan], [1.0, np.nan])
False
>>> np.allclose([1.0, np.nan], [1.0, np.nan], equal_nan=True)
True
```


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