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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
... suggestion with unique() is a great help. That ought to be in the FAQ. I know Matthew Dowle "designed it for his own use, and he wanted it that way." (FAQ 1.9), but I thought X[Y,all=T] could be an elegant way to specify a full outer join within the data.table X[Y] syntax. Or X[Y,all.x=T] for the ...
How to make an Android device vibrate?
I wrote an Android application. Now, I want to make the device vibrate when a certain action occurs. How can I do this?
13 ...
Serving static files with Sinatra
...I want to deploy the app to Heroku, but I cannot find a way to do it. I am now trying to make the app working with Sinatra.
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Get cookie by name
... is enclosed with "; " and "=":
"; {name}={value}; {name}={value}; ..."
Now, we can first split by "; {name}=", and if token is found in a cookie string (i.e. we have two elements), we will end up with second element being a string that begins with our cookie value. Then we pull that out from an ...
How do I read the source code of shell commands?
...inux commands are written with. I've gained some experience using them and now I think it's time to interact with my machine at a deeper level.
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About .bash_profile, .bashrc, and where should alias be written in? [duplicate]
...!), shell options with set and shopt, etc. For an example, see: My .bashrc
Now, as part of UNIX peculiarity, a login-shell does NOT execute ~/.bashrc but only ~/.profile or ~/.bash_profile, so you should source that one manually from the latter. You'll see me do that in my ~/.profile too: source ~/...
How to tell PowerShell to wait for each command to end before starting the next?
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My bad. Start-Process -Wait works great, but now I see it this is not what I was looking for... I'm actually seeking to wait until the vm to finishes booting. I imagine that's going to be tough. I suppose I'll have to find a new thread for that. Thanks but.
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Vertically align text within a div [duplicate]
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Update April 10, 2016
Flexboxes should now be used to vertically (or even horizontally) align items.
body {
height: 150px;
border: 5px solid cyan;
font-size: 50px;
display: flex;
align-items: center; /* Vertical center alignment */
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How do I handle ImeOptions' done button click?
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I know this question is old, but I want to point out what worked for me.
I tried using the sample code from the Android Developers website (shown below), but it didn't work. So I checked the EditorInfo class, and I realized tha...
Setting EditText imeOptions to actionNext has no effect
...Line="true" />
I'm not a fan of using a deprecated attribute, but for now it seems to get the desired result.
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