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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
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C++ preprocessor __VA_ARGS__ number of arguments
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How to sort a list in Scala by two fields?
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217
rows.sortBy(r => (r.lastName, r.firstName))
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Redirect STDERR / STDOUT of a process AFTER it's been started, using command line?
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126
Short of closing and reopening your tty (i.e. logging off and back on, which may also terminat...
Static variables in member functions
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169
Since class A is a non-template class and A::foo() is a non-template function. There will be o...
Best way to make Java's modulus behave like it should with negative numbers?
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It behaves as it should a % b = a - a / b * b; i.e. it's the remainder.
You can do (a % b + b...
how to find host name from IP with out login to the host
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Relative frequencies / proportions with dplyr
...se(n = n()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That mak...
OAuth: how to test with local URLs?
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139
Update October 2016: Easiest now: use lvh.me which always points to 127.0.0.1.
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The modulo operation on negative numbers in Python
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Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as t...