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How does the Amazon Recommendation feature work?
...nce. Typical fields of study revolve around market basket analysis (also called affinity analysis) which is a subset of the field of data mining. Typical components in such a system include identification of primary driver items and the identification of affinity items (accessory upsell, cross sel...
How can I detect the touch event of an UIImageView?
...cify images) over the UIImageView. Then attach whatever methods you want called to that.
You can use that technique for many cases where you really want some area of the screen to act as a button instead of messing with the Touch stuff.
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How do I check if a number is positive or negative in C#?
...rSimon Fischer
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Initializing a struct to 0
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The first is easiest(involves less typing), and it is guaranteed to work, all members will be set to 0[Ref 1].
The second is more readable.
The choice depends on user preference or the one which your coding standard mandates.
[Ref 1] Reference C99 Standard 6.7.8.21:
If there are fewe...
Cleaner way to update nested structures
...scalaz.TreeLoc). It turns out that the structure of the zipper is automatically derivable from the original data structure, in a manner that resembles symbolic differentiation of an algebraic expression.
But how does this help you with your Scala case classes? Well, Lukas Rytz recently prototyped a...
Bash empty array expansion with `set -u`
...ad. Other patterns, such as ${arr[@]-} or ${arr[@]:0}, are not safe across all major versions of Bash.
As the table below shows, the only expansion that is reliable across all modern-ish Bash versions is ${arr[@]+"${arr[@]}"} (column +"). Of note, several other expansions fail in Bash 4.2, includin...
When do you use Java's @Override annotation and why?
... that you can take advantage of the compiler checking to make sure you actually are overriding a method when you think you are. This way, if you make a common mistake of misspelling a method name or not correctly matching the parameters, you will be warned that you method does not actually override...
C# Sort and OrderBy comparison
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I think, it's much different of sorting a very small list (3 items) 1000000 times, or by sorting a very large list (1000000 items) just a few times. Both is very relevant. In practice, medium size of list (what's medium? ... let's say 1000 items for now) is most interesting...
Check whether variable is number or string in JavaScript
...ject.prototype.toString;
_.isString = function (obj) {
return toString.call(obj) == '[object String]';
}
This returns a boolean true for the following:
_.isString("Jonathan"); // true
_.isString(new String("Jonathan")); // true
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Java inner class and static nested class
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Mind that you can also import a static nested class directly, i.e. you could do (at the top of the file): import OuterClass.StaticNestedCl...