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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... return x*2, x*3
...:
In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], df["A2"] = zip(*df["a"].map(calculate))
In [6]: df
Out[6]:
a b A1 A2
0 1 2 2 3
1 2 3 4 6
2 3 4 6 9
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supervacuo
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answered Sep 1 '14 at 14:25
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Add column to SQL Server
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answered Apr 14 '11 at 16:07
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Using HeapDumpOnOutOfMemoryError parameter for heap dump for JBoss
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View.setPadding accepts only in px, is there anyway to setPadding in dp?
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answered Nov 25 '10 at 10:21
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Jackson how to transform JsonNode to ArrayNode without casting?
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Why does the JavaScript need to start with “;”?
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edited May 9 '14 at 20:41
SQLMason
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answered Mar 20 ...