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February 7, 2018 21:53
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Pandasで各行に任意の関数を適用するサンプル。遅いらしい:-)
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In [1]: import pandas as pd | |
In [2]: data = {'a': [0,1,2], 'b': [3,4,5]} | |
...: df = pd.DataFrame(data) | |
...: df | |
...: | |
Out[2]: | |
a b | |
0 0 3 | |
1 1 4 | |
2 2 5 | |
In [3]: def f(r): | |
...: return '{:d} + {:d} = {:d}'.format(r['a'], r['b'], r['a'] + r['b']) | |
...: | |
In [4]: df['c'] = df.apply(f, axis=1) | |
...: df | |
...: | |
Out[4]: | |
a b c | |
0 0 3 0 + 3 = 3 | |
1 1 4 1 + 4 = 5 | |
2 2 5 2 + 5 = 7 |
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