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Why Func instead of Predicate?
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What is Hindley-Milner?
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Python != operation vs “is not”
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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...p_by(Species, .drop=FALSE) %>% tally
#> Species n
#> 1 setosa 50
#> 2 versicolor 50
#> 3 virginica 50
#> 4 empty_level 0
# Add character column
iris$group2 = c(rep(c("A","B"), 50), rep(c("B","C"), each=25))
# Empty groups involving combinations of ...
Understanding Fragment's setRetainInstance(boolean)
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As far as I can tell, if you have setRetainInstance(true), the Fragment java object, and all its contents are not destroyed on rotation, but the view is recreated. That is onCreatedView() is called again. It's basically the way it should have worked with Acti...
Does free(ptr) where ptr is NULL corrupt memory?
... ptr.
If ptr is a NULL pointer, no operation is performed.
When you set the pointer to NULL after free() you can call free() on it again and no operation will be performed.
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Make install, but not to default directories?
...f the Makefile is generated by GNU autotools (./configure) you can usually set the target location like so:
./configure --prefix=/somewhere/else/than/usr/local
If the Makefile is not generated by autotools, but distributed along with the software, simply open it up in an editor and change it. The...
How to increment a pointer address and pointer's value?
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Boost Statechart vs. Meta State Machine
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Assigning variables with dynamic names in Java
I'd like to assign a set of variables in java as follows:
7 Answers
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