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Fastest way to find second (third…) highest/lowest value in vector or column
R offers max and min, but I do not see a really fast way to find another value in the order, apart from sorting the whole vector and then picking a value x from this vector.
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What does this thread join code mean?
In this code, what does the two joins and break mean? t1.join() causes t2 to stop until t1 terminates?
10 Answers
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Difference between Select and ConvertAll in C#
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Select is a LINQ extension method and works on all IEnumerable<T> objects whereas ConvertAll is implemented only by List<T>. The ConvertAll method exists since .NET 2.0 whereas LINQ was introduced with 3.5.
You should favor Select over ConvertAll...
Best practices for overriding isEqual: and hash
...ive you do
result = prime * result + var
For objects you use 0 for nil and otherwise their hashcode.
result = prime * result + [var hash];
For booleans you use two different values
result = prime * result + ((var)?1231:1237);
Explanation and Attribution
This is not tcurdt's work, and ...
Why should C++ programmers minimize use of 'new'?
...on Memory leak with std::string when using std::list<std::string> , and one of the comments says this:
18 Answers
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Is volatile expensive?
...LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad and LoadStore are effectively no-ops on X86 CPUs. Does this mean that volatile read operations can be done without a explicit cache invalidation on x86, and is as fast as a normal variable read (disregarding the reordering co...
OS detecting makefile
I routinely work on several different computers and several different operating systems, which are Mac OS X, Linux, or Solaris. For the project I'm working on, I pull my code from a remote git repository.
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Debugging “Element is not clickable at point” error
...our element is wrapped in a div or a span. The page can be fully loaded, and completely within the viewport, but Chromedriver will refuse to click it, where the webdriver for FF and IE have no issue. A real human has no clue that the span exists, and the browser doesn't care when you actually cli...
How to terminate a Python script
I am aware of the die() command in PHP which exits a script early.
10 Answers
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What is the difference between named and positional parameters in Dart?
Dart supports both named optional parameters and positional optional parameters. What are the differences between the two?
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