回答編集履歴
4
test
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@@ -1,4 +1,4 @@
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※ 重複のない組み合わせ(`freq == 0`)を merge
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※ 重複のない組み合わせ(`freq == 0`)を merge で補完。
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2
2
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```python
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3
3
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import pandas as pd
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4
4
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from itertools import combinations
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3
test
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@@ -1,4 +1,4 @@
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※ 重複のない組み合わせ(`freq == 0`)を merge(
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※ 重複のない組み合わせ(`freq == 0`)を merge(right join) で補完。
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2
2
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```python
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3
3
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import pandas as pd
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4
4
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from itertools import combinations
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2
test
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@@ -1,7 +1,38 @@
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1
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※ 重複のない組み合わせ(`freq == 0`)を merge(left join) で補完。
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2
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```python
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3
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import pandas as pd
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4
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from itertools import combinations
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5
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6
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df = pd.DataFrame({
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7
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'group': [*['A']*4, *['B']*3, *['C']*5, *['D']*4],
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8
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'person': [1, 2, 3, 4, 2, 5, 6, 4, 7, 8, 9, 10, 2, 3, 7, 12],
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9
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})
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10
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11
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dfx = df.groupby('person')['group']\
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12
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.apply(lambda g: [*combinations(g, 2)])\
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13
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.explode().value_counts().sort_index().to_frame('freq')
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14
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comb = pd.DataFrame(index=[*combinations(df['group'].unique(), 2)])
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15
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dfx = pd.merge(comb, dfx, left_index=True, right_index=True, how='left')\
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16
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.fillna(0, downcast='infer')
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17
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dfx = pd.DataFrame(dfx['freq'], index=pd.MultiIndex.from_tuples(dfx.index))\
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.rename_axis(['group1', 'group2']).reset_index()
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print(dfx)
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1
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-
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21
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```
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22
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23
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| group1 | group2 | freq |
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24
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|:--------:|:--------:|-------:|
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25
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| A | B | 1 |
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26
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| A | C | 1 |
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27
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| A | D | 2 |
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28
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| B | C | 0 |
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29
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| B | D | 1 |
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30
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| C | D | 1 |
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2
31
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3
32
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4
33
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5
34
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6
35
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7
36
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37
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38
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1
test
CHANGED
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@@ -1,29 +1,7 @@
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1
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※ 以前の質問の際にも述べましたが、組み合わせ数は `3000 * 2999 / 2 = 4,498,500` 通りになります。処理時間がどの程度になるのか、こちらでは確認していません。
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2
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-
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1
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※ 削除
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3
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import pandas as pd
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4
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from itertools import combinations
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5
2
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6
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df = pd.DataFrame({
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7
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'group': [*['A']*4, *['B']*3, *['C']*5, *['D']*4],
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8
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'person': [1, 2, 3, 4, 2, 5, 6, 4, 7, 8, 9, 10, 2, 3, 7, 12],
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9
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})
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3
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11
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comb = [*combinations(df['group'].unique(), 2)]
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12
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dfx = df.set_index('group')
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13
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dfx = pd.DataFrame(
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[dfx.loc[c,:].duplicated().sum() for c in comb],
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index=pd.MultiIndex.from_tuples(comb))\
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.reset_index().set_axis(['group1', 'group2', 'freq'], axis=1)
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4
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print(dfx)
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19
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```
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20
5
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21
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| group1 | group2 | freq |
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22
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|:--------:|:--------:|-------:|
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| A | B | 1 |
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24
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| A | C | 1 |
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25
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| A | D | 2 |
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26
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| B | C | 0 |
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27
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| B | D | 1 |
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28
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| C | D | 1 |
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29
6
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7
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