回答編集履歴
1
test
CHANGED
|
@@ -51,3 +51,77 @@
|
|
|
51
51
|
# 2 2 500 600
|
|
52
52
|
|
|
53
53
|
```
|
|
54
|
+
|
|
55
|
+
|
|
56
|
+
|
|
57
|
+
---
|
|
58
|
+
|
|
59
|
+
|
|
60
|
+
|
|
61
|
+
なお、`df1`のインデックスが重複している場合や、より高速な処理を求める場合は以下の方法で
|
|
62
|
+
|
|
63
|
+
|
|
64
|
+
|
|
65
|
+
```python
|
|
66
|
+
|
|
67
|
+
import numpy as np
|
|
68
|
+
|
|
69
|
+
|
|
70
|
+
|
|
71
|
+
df1 = pd.DataFrame({'n': [2, 3, 2],
|
|
72
|
+
|
|
73
|
+
'a': [100, 300, 500],
|
|
74
|
+
|
|
75
|
+
'b': [200, 400, 600]},
|
|
76
|
+
|
|
77
|
+
index=[1, 2, 1])
|
|
78
|
+
|
|
79
|
+
|
|
80
|
+
|
|
81
|
+
df1.loc[df1.index.repeat(df1['n'])] # インデックスが重複していると結果が正しくない
|
|
82
|
+
|
|
83
|
+
# n a b
|
|
84
|
+
|
|
85
|
+
# 1 2 100 200
|
|
86
|
+
|
|
87
|
+
# 1 2 500 600
|
|
88
|
+
|
|
89
|
+
# 1 2 100 200
|
|
90
|
+
|
|
91
|
+
# 1 2 500 600
|
|
92
|
+
|
|
93
|
+
# 2 3 300 400
|
|
94
|
+
|
|
95
|
+
# 2 3 300 400
|
|
96
|
+
|
|
97
|
+
# 2 3 300 400
|
|
98
|
+
|
|
99
|
+
# 1 2 100 200
|
|
100
|
+
|
|
101
|
+
# 1 2 500 600
|
|
102
|
+
|
|
103
|
+
# 1 2 100 200
|
|
104
|
+
|
|
105
|
+
# 1 2 500 600
|
|
106
|
+
|
|
107
|
+
|
|
108
|
+
|
|
109
|
+
df1.iloc[np.repeat(np.arange(len(df1)), df1['n'].to_numpy())] # 正しく、かつ高速
|
|
110
|
+
|
|
111
|
+
# n a b
|
|
112
|
+
|
|
113
|
+
# 1 2 100 200
|
|
114
|
+
|
|
115
|
+
# 1 2 100 200
|
|
116
|
+
|
|
117
|
+
# 2 3 300 400
|
|
118
|
+
|
|
119
|
+
# 2 3 300 400
|
|
120
|
+
|
|
121
|
+
# 2 3 300 400
|
|
122
|
+
|
|
123
|
+
# 1 2 500 600
|
|
124
|
+
|
|
125
|
+
# 1 2 500 600
|
|
126
|
+
|
|
127
|
+
```
|