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How can I obtain the element-wise logical NOT of a pandas Series?
... Pandas 0.13.0, Series are no longer subclasses of numpy.ndarray; they are now subclasses of pd.NDFrame. This might have something to do with why np.invert(s) is no longer as fast as ~s or -s.
Caveat: timeit results may vary depending on many factors including hardware, compiler, OS, Python, NumPy ...
What is the difference between a weak reference and an unowned reference?
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Both weak and unowned references do not create a strong hold on the referred object (a.k.a. they don't increase the retain count in order to prevent ARC from deallocating the referred object).
But why two keywords? This distinction has to d...
Best architectural approaches for building iOS networking applications (REST clients)
...esting in the problems of building approaches, which combine several well-known patterns and idioms. I think a lot of Fowler's enterprise patterns can be successfully applied to the mobile applications. Here is a list of the most interesting ones, which we can apply for creating an iOS application a...
Bootstrap NavBar with left, center or right aligned items
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2019 Update
Bootstrap 4
Now that Bootstrap 4 has flexbox, Navbar alignment is much easier. Here are updated examples for left, right and center in the Bootstrap 4 Navbar, and many other alignment scenarios demonstrated here.
The flexbox, auto-margi...
Difference between attr_accessor and attr_accessible
...ode to (quickly) create setter and getter methods in a Class. That's all.
Now, what is missing as an explanation is that when you create somehow a link between a (Rails) model with a database table, you NEVER, NEVER, NEVER need attr_accessor in your model to create setters and getters in order to b...
How does the “this” keyword work?
...meters of fun bound to the parameters specified arg1, arg2, arg3,....
By now the difference between apply, call and bind must have become apparent. apply allows to specify the arguments to function as array-like object i.e. an object with a numeric length property and corresponding non-negative in...
Using a piano keyboard as a computer keyboard [closed]
...played piano for around 20 years without any pain issues. I would like to know if there is a way to capture MIDI from a MIDI keyboard and output keyboard strokes. I know nothing at all about MIDI but I would like some guidance on how to convert this signal into a keystroke.
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Visual Studio keyboard shortcut to automatically add the needed 'using' statement
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Wow, didn't know about Ctrl+. or Alt+Shift+F10, but always wondered if there was such a short-cut. I also have a function lock keyboard, but it always remembers its state, so no problem here (Microsoft Natural Ergonomics Keyboard 4000).
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Centering the pagination in bootstrap
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I don't know when drive-by downvoting became cool, but your first answer works for me so have an upvote.
– David Harbage
Nov 27 '13 at 1:20
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How to manually create icns files using iconutil?
... has been broken in El Capitan? Upgraded my Mac to 10.11.3 and this script now returns "error: Unsuported image format" then "/Users/IconScript/MyIcon-osx.iconset:error: Variant named 'icon' contains no image resources." then "MyIcon-osx.iconset:error: Failed to generate ICNS." Tried the same script...