【问题标题】:Masked values in numpy digitizenumpy digitize 中的屏蔽值
【发布时间】:2019-11-19 11:50:12
【问题描述】:
我希望numpy digitize 忽略我数组中的一些值。为了实现这一点,我用NaN 替换了不需要的值并屏蔽了NaN 值:
import numpy as np
A = np.ma.array(A, mask=np.isnan(A))
尽管如此,np.digitize 将掩码值抛出为-1。有没有其他方法可以让np.digitize 忽略屏蔽值(或NaN)?
【问题讨论】:
标签:
python
numpy
nan
masked-array
【解决方案1】:
我希望它不是性能优化,否则你可以
数字化功能后的掩码:
import numpy as np
A = np.arange(10,dtype=np.float)
A[0] = np.nan
A[-1] = np.nan
bins = np.array([1,2,7])
res = np.digitize(A,bins)
# here np.nan is assigned to the highes bin
# using numpy '1.17.2'
print(res)
# sp you mask you array after the execution of
# np.digitize
print(res[~np.isnan(A)])
>>> [3 1 2 2 2 2 2 3 3 3]
>>> [1 2 2 2 2 2 3 3]