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What does the thread_local mean in C++11?
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Daniel Kamil Kozar
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answered Aug 16 '12 at 9:13
paxdiablopaxdiablo
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Why does Python code run faster in a function?
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You might ask why it is faster to store local variables than globals. This is a CPython impleme...
Using emit vs calling a signal as if it's a regular function in Qt
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Do you know if there was ever an implementation (or a planned implementation) of an emit that actually did more than nothing? I find that h...
Why not use always android:configChanges=“keyboardHidden|orientation”?
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4 Answers
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When to use , tag files, composite components and/or custom components?
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BalusCBalusC
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Summarizing multiple columns with dplyr? [duplicate]
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#> 1 1 3.08 2.98 2.98 2.91
#> 2 2 3.03 3.04 2.97 2.87
#> 3 3 2.85 2.95 2.95 3.06
If you want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrlyr package provides the same functionality:
library(purr...
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... Steve JessopSteve Jessop
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How to use WeakReference in Java and Android development?
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Boolean operators && and ||
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How to sort a list of lists by a specific index of the inner list?
...>>> from operator import itemgetter
>>> L=[[0, 1, 'f'], [4, 2, 't'], [9, 4, 'afsd']]
>>> sorted(L, key=itemgetter(2))
[[9, 4, 'afsd'], [0, 1, 'f'], [4, 2, 't']]
It is also possible to use a lambda function here, however the lambda function is slower in this simple case
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