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How do I launch the Android emulator from the command line?
...om the terminal. I have successfully created the HelloWorld project and now I'm trying to run it from the command line in the Android emulator. Which command runs the emulator for my HelloWorld project?
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How to calculate the time interval between two time strings
...statistics mean and variance functions work directly with timedelta object now? Any thought on that? Also, any help to compute the variance of timedelta objects will be useful.
– CKM
Feb 9 '17 at 10:04
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Difference between Covariance & Contra-variance
...s T → IE<T>. Notice that this is a "thin arrow".
With me so far?
Now let's consider a relation. There is an assignment compatibility relationship between pairs of types in the first set. A value of type Tiger can be assigned to a variable of type Animal, so these types are said to be "assi...
Installing vim with ruby support (+ruby)
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I think "Compiling Vim With Ruby Integration On Snow Leopard" might actually help. I'm on exactly same boat at the moment.
Ok... got it to work. Took me like half hour or so.
This should help (I got Ubuntu):
sudo apt-get install mercurial
hg clone https://vim.googlecod...
SPAN vs DIV (inline-block)
...pec, <span> is an inline element and <div> is a block element. Now that can be changed using the display CSS property but there is one issue: in terms of HTML validation, you can't put block elements inside inline elements so:
<p>...<div>foo</div>...</p>
is not...
Select N random elements from a List in C#
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@recursive: The proof is almost trivial. We know how to select K items out of K for any K and how to select 0 items out of N for any N. Assume we know a method to uniformly select K or K-1 items out of N-1 >= K; then we can select K items out of N by selecting the fi...
EC2 Can't resize volume after increasing size
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This answer is now deprecated now that AWS supports online resizing for EBS volumes.
– Dale Anderson
Jul 6 '17 at 17:49
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Why are Oracle table/column/index names limited to 30 characters?
...understand that many years ago there would be this kind of limitation, but nowadays surely this limit could easily be increased. We have naming conventions for objects, but there is always a case that turns up where we hit this limit - especially in naming foreign keys.
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How to detect if multiple keys are pressed at once using JavaScript?
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Note: keyCode is now deprecated.
Multiple keystroke detection is easy if you understand the concept
The way I do it is like this:
var map = {}; // You could also use an array
onkeydown = onkeyup = function(e){
e = e || event; // to deal w...
Inheritance vs. Aggregation [closed]
...s is more or less as the original class. Use inheritance. The new class is now a subclass of the original class.
If the new class must have the original class. Use aggregation. The new class has now the original class as a member.
However, there is a big gray area. So we need several other tricks....