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Apply multiple functions to multiple groupby columns
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Is there something like RStudio for Python? [closed]
...e app not a browser tool) for Windows, Mac & Linux in 2016. It's a lot more stable than it was and has lots of new features like syntax highlighting and integrated tutorials. Definitely worth checking out if you like RStudio!
– Elise Breda
Oct 11 '16 at 21:...
Jump to function definition in vim
... Then you can just jump to the function definition using Ctrl-]
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Learning Ruby on Rails
As it stands now, I'm a Java and C# developer. The more and more I look at Ruby on Rails, the more I really want to learn it.
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Extract substring in Bash
Given a filename in the form someletters_12345_moreleters.ext , I want to extract the 5 digits and put them into a variable.
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Java: is there a map function?
...a 8, there is actually a map function, so I'd probably write the code in a more concise way:
Collection<String> hex = input.stream()
.map(Integer::toHexString)
.collect(Collectors::toList);
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How and where are Annotations used in Java?
...to be stored somewhere else, and XML files were frequently used. But it is more convenient to use annotations because they will belong to the Java code itself, and are hence much easier to manipulate than XML.
Usage of annotations:
Documentation, e.g. XDoclet
Compilation
IDE
Testing framework, e....
The Definitive C++ Book Guide and List
...sents rules of thumb along with their rationale. [Review]
Intermediate
More Effective C++ (Scott Meyers) Even more rules of thumb than Effective C++. Not as important as the ones in the first book, but still good to know.
Exceptional C++ (Herb Sutter) Presented as a set of puzzles, this has on...
Array extension to remove object by value
...s, it is now actually possible to write a method on a generic type that is more restrictive on the template, so the method
could now actually be defined as an extension of Array:
extension Array where Element : Equatable {
// ... same method as above ...
}
The protocol extension still has th...
Using i and j as variables in Matlab
...n ancient versions of Matlab maybe. I used to see that myself. But not any more with R2012a+ (OS X) at least. And I saw no difference when calling a for loop 1 billion times and trying all manner of timing schemes. I'm seeing new SO users being told that perfectly valid code is wrong because they're...