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Algorithm to generate all possible permutations of a list?
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32 Answers
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How do I determine k when using k-means clustering?
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You can maximize the Bayesian Information Criterion (BIC):
BIC(C | X) = L(X | C) - (p / 2) * lo...
Difference between Apache CXF and Axis
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Keep in mind, I'm completely biased (PMC Chair of CXF), but my thoughts:
From a strictly "can...
How to use JavaScript variables in jQuery selectors?
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var name = this.name;
$("input[name=" + name + "]").hide();
OR you can do something like thi...
How to check if a number is a power of 2
Today I needed a simple algorithm for checking if a number is a power of 2.
25 Answers
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Compile time string hashing
...s is a little bit late, but I succeeded in implementing a compile-time CRC32 function with the use of constexpr. The problem with it is that at the time of writing, it only works with GCC and not MSVC nor Intel compiler.
Here is the code snippet:
// CRC32 Table (zlib polynomial)
static constexpr u...
What is the most efficient way to concatenate N arrays?
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20 Answers
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Jackson databind enum case insensitive
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In version 2.4.0 you can register a custom serializer for all the Enum types (link to the github issue). Also you can replace the standard Enum deserializer on your own that will be aware about the Enum type. Here is an example:
public...
Update Eclipse with Android development tools v. 23
I updated Eclipse with the new SDK tools (rev. 23), but now when Eclipse starts I receive the error:
43 Answers
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What does the Ellipsis object do?
...is is an object that can appear in slice notation. For example:
myList[1:2, ..., 0]
Its interpretation is purely up to whatever implements the __getitem__ function and sees Ellipsis objects there, but its main (and intended) use is in the numpy third-party library, which adds a multidimensional ...