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How to access the last value in a vector?

Suppose I have a vector that is nested in a dataframe one or two levels. Is there a quick and dirty way to access the last value, without using the length() function? Something ala PERL's $# special var? ...
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Is there a documented way to set the iPhone orientation?

I have an app where I would like to support device rotation in certain views but other don't particularly make sense in Landscape mode, so as I swapping the views out I would like to force the rotation to be set to portrait. ...
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Regular vs Context Free Grammars

I'm studying for my computing languages test, and there's one idea I'm having problems wrapping my head around. 8 Answe...
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“ImportError: No module named” when trying to run Python script

I'm trying to run a script that launches, amongst other things, a python script. I get a ImportError: No module named ..., however, if I launch ipython and import the same module in the same way through the interpreter, the module is accepted. ...
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Making a LinearLayout act like an Button

I have a LinearLayout that I've styled to look like a button , and it contains a few text/ImageView elements. I would like to make the whole LinearLayout act like a button , in particular to give it states that are defined in a so it has a different background when it is pressed. ...
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How can I determine if a .NET assembly was built for x86 or x64?

I've got an arbitrary list of .NET assemblies. 15 Answers 15 ...
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What is the difference between is_a and instanceof?

I am aware that instanceof is an operator and that is_a is a method. 9 Answers 9 ...
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Retrieve list of tasks in a queue in Celery

How can I retrieve a list of tasks in a queue that are yet to be processed? 14 Answers ...
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Mercurial — revert back to old version and continue from there

I'm using Mercurial locally for a project (it's the only repo there's no pushing/pulling to/from anywhere else). 7 Answers ...
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Xcode duplicate/delete line

Coming from Eclipse and having been used to duplicate lines all the time, it's pretty strange finding out that Xcode has no such function. Or does it? ...