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Javascript: Round up to the next multiple of 5
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283
This will do the work:
function round5(x)
{
return Math.ceil(x/5)*5;
}
It's just a variat...
Android, How can I Convert String to Date?
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431
From String to Date
String dtStart = "2010-10-15T09:27:37Z";
SimpleDateFormat format = new S...
Dynamically select data frame columns using $ and a character value
... a reproducible example below:
# set seed for reproducibility
set.seed(123)
df <- data.frame( col1 = sample(5,10,repl=T) , col2 = sample(5,10,repl=T) , col3 = sample(5,10,repl=T) )
# We want to sort by 'col3' then by 'col1'
sort_list <- c("col3","col1")
# Use 'do.call' to call order. Sec...
How to generate a random number in C++?
...:mersenne_twister_engine<> (and its convenience typedefs - std::mt19937/std::mt19937_64 with good template parameters combination) provides per-object pseudo-random number generator defined in C++11 standard. With the same template parameters and the same initialization parameters different ob...
pytest: assert almost equal
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I noticed that this question specifically asked about py.test. py.test 3.0 includes an approx() function (well, really class) that is very useful for this purpose.
import pytest
assert 2.2 == pytest.approx(2.3)
# fails, default is ± 2.3e-06
assert 2.2 == pytest.approx(2.3, 0.1)
# passes
# al...
How does Stack Overflow generate its SEO-friendly URLs?
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302
Here's how we do it. Note that there are probably more edge conditions than you realize at fir...
Polymorphism in C++
... and templates provide static (compile-time) polymorphism. TC++PL 12.2.6, 13.6.1, D&E 2.9.
This answer - like the question - relates C++ features to the Comp. Sci. terminology.
Discussion
With the C++ Standard using a narrower definition of "polymorphism" than the Comp. Sci. community, to en...
Sending HTTP POST Request In Java
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349
Updated Answer:
Since some of the classes, in the original answer, are deprecated in the newe...