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What's the fastest way to merge/join data.frames in R?
...
DF1 = data.frame(a = c(1, 1, 2, 2), b = 1:4)
DF2 = data.frame(b = c(1, 2, 3, 3, 4), c = letters[1:5])
merge(DF1, DF2)
b a c
1 1 1 a
2 2 1 b
3 3 2 c
4 3 2 d
5 4 2 e
DF1$c = DF2$c[match(DF1$b, DF2$b)]
DF1$c
[1] a b c e
Levels: a b c d e
> DF1
a b c
1 1 1 a
2 1 2 b
3 2 3 c
4 2 4 e
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What's the best way to generate a UML diagram from Python source code? [closed]
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136
You may have heard of Pylint that helps statically checking Python code. Few people know that i...
Can I use Twitter Bootstrap and jQuery UI at the same time?
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13 Answers
13
Active
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What's the best way to inverse sort in scala?
...ur answer!
– schmmd
Oct 19 '11 at 4:38
Except that it does not work. I should never answer when I have no REPL handy. ...
List comprehension rebinds names even after scope of comprehension. Is this right?
...omprehensions leak the loop control variable in Python 2 but not in Python 3. Here's Guido van Rossum (creator of Python) explaining the history behind this:
We also made another change in Python
3, to improve equivalence between list
comprehensions and generator
expressions. In Python 2,...
Determine Whether Integer Is Between Two Other Integers?
...other integers (e.g. greater than/equal to 10000 and less than/equal to 30000 )?
11 Answers
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Force point (“.”) as decimal separator in java
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answered Mar 8 '11 at 17:32
Jon SkeetJon Skeet
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What does the tilde (~) mean in my composer.json file?
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3 Answers
3
Active
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Algorithm to find Largest prime factor of a number
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134
Actually there are several more efficient ways to find factors of big numbers (for smaller ones...
Return multiple columns from pandas apply()
...ue) + ' MB'
s['size_gb'] = locale.format("%.1f", s['size'] / 1024.0 ** 3, grouping=True) + ' GB'
return s
df_test = df_test.append(rows_list)
df_test = df_test.apply(sizes, axis=1)
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