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How can a Java variable be different from itself?
...
One simple way is to use Float.NaN:
float x = Float.NaN; // <--
if (x == x) {
System.out.println("Ok");
} else {
System.out.println("Not ok");
}
Not ok
You can do the same with Double.NaN.
From JLS §15.21.1....
When do we have to use copy constructors?
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@Martin: I wanted to make sure it was carved in stone. :P
– GManNickG
Jul 19 '10 at 6:04
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show 9 more comments
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.NET 4.0 has a new GAC, why?
...\assembly\ is the new GAC . Does it mean now we have to manage two GACs, one for .NET 2.0-3.5 applications and the other for .NET 4.0 applications?
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Multiple inheritance/prototypes in JavaScript
...ndamental operations.
When creating an object which inherits from another one, we use Object.create(obj). But in this case we want multiple inheritance, so instead of obj I use a proxy that will redirect fundamental operations to the appropriate object.
I use these traps:
The has trap is a trap ...
Intelligent point label placement in R
... fall into roughly three categories:
You have a small number of points, none which are terribly close together. In this case, one of the solutions you listed in the question is likely to work with fairly minimal tweaking.
You have a small number of points, some of which are too closely packed for ...
Android Camera Preview Stretched
...st of supportedPreviewSizes it will choose the best for you from avaliable ones. Get your supportedPreviewSize list in place where Camera object isn't null by using
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
And then on in onMeasure you can get your optimal pre...
Is there a point to minifying PHP?
...er named HipHop that transforms PHP source into C++ code. Rasmus Lerdorf, one of the big PHP guys did a presentation for Digg earlier this year that covers the performance improvements given by HipHop. In short, it's not too much faster than optimizing code and using a bytecode cache. HipHop is o...
How do you unit test a Celery task?
...aly do 2 different test sessions when working with celery tasks. The first one (as I'm suggesting bellow) is completely synchronous and should be the one that makes sure the algorithm does what it should do. The second session uses the whole system (including the broker) and makes sure I'm not havin...
Add column with constant value to pandas dataframe [duplicate]
.... In general, pandas tries to do as much alignment of indices as possible. One downside is that when indices are not aligned you get NaN wherever they aren't aligned. Play around with the reindex and align methods to gain some intuition for alignment works with objects that have partially, totally, ...
Difference between case object and object
...tly what it says it is, an object, i.e. a declaration and instantiation in one. This limits object to a single instance if defined in package scope, which effectively makes it a singleton, but only if defined IN THAT SCOPE. If defined inside a class, you can have as many instances as the class itsel...