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C++ performance challenge: integer to std::string conversion
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13 Answers
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Can dplyr package be used for conditional mutating?
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Use ifelse
df %>%
mutate(g = ifelse(a == 2 | a == 5 | a == 7 | (a == 1 & b == 4), 2,
ifelse(a == 0 | a == 1 | a == 4 | a == 3 | c == 4, 3, NA)))
Added - if_else: Note that in dplyr 0.5 there is an if_else function defined so an alternative would be to replace ifelse with i...
If vs. Switch Speed
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185
The compiler can build jump tables where applicable. For example, when you use the reflector t...
Converting a column within pandas dataframe from int to string
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142
In [16]: df = DataFrame(np.arange(10).reshape(5,2),columns=list('AB'))
In [17]: df
Out[17]:
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How to determine the longest increasing subsequence using dynamic programming?
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19 Answers
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Best way to display decimal without trailing zeroes
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14 Answers
14
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Converting RGB to grayscale/intensity
...nels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
8 Answers
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Twitter oAuth callbackUrl - localhost development
...bled recently. http://code.google.com/p/twitter-api/issues/detail?id=534#c1
17 Answers
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What's the best way to send a signal to all members of a process group?
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