相关疑难解决方法(0)

我有一个pandas数据帧,具有以下结构:

import numpy as np
import pandas as pd
myData = pd.DataFrame({'x': [1.2,2.4,5.3,2.3,4.1], 'y': [6.7,7.5,8.1,5.3,8.3], 'condition':[1,1,np.nan,np.nan,1],'calculation': [np.nan]*5})

print myData

   calculation  condition    x    y
0          NaN          1  1.2  6.7
1          NaN          1  2.4  7.5
2          NaN        NaN  5.3  8.1
3          NaN        NaN  2.3  5.3
4          NaN          1  4.1  8.3

我想根据'x'和'y'(例如x/y)中的值在'calculation'列中输入一个值,但仅限于'condition'列包含NaN的那些单元格中(np.isnan(myData [ 'condition']).最终的数据框应如下所示:

   calculation  condition    x    y
0          NaN          1  1.2  6.7
1          NaN          1  2.4  7.5
2        0.654        NaN  5.3  8.1
3        0.434        NaN  2.3  5.3
4          NaN          1  4.1  8.3 …