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Fastest way to replace NAs in a large data.table
... data.table , with many missing values scattered throughout its ~200k rows and 200 columns. I would like to re code those NA values to zeros as efficiently as possible.
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invalid context 0x0 under iOS 7.0 and system degradation
...oubt that's the issue. These invalid context 0x0 error messages are common and easy to reproduce in iOS 7. In fact, I can reproduce the error using storyboard with zero code. I drag a UITextField onto the canvas in IB, run the app, and double tap inside the text field.
In many situations, it's har...
Is it bad to have my virtualenv directory inside my git repository?
... repository for the app. It seems like an easy way to keep deploy's simple and easy. Is there any reason why I shouldn't do this?
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What is the difference between 'E', 'T', and '?' for Java generics?
...the Java programming language
Angelika Langer's Java Generics FAQ (massive and comprehensive; more for reference though)
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How to manage a redirect request after a jQuery Ajax call
I'm using $.post() to call a servlet using Ajax and then using the resulting HTML fragment to replace a div element in the user's current page. However, if the session times out, the server sends a redirect directive to send the user to the login page. In this case, jQuery is replacing the div ...
Can enums be subclassed to add new elements?
I want to take an existing enum and add more elements to it as follows:
15 Answers
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Combined area of overlapping circles
I recently came across a problem where I had four circles (midpoints and radius) and had to calculate the area of the union of these circles.
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What is Turing Complete?
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Alan Turing created a machine that can take a program, run that program, and show some result. But then he had to create different machines for different programs. So he created "Universal Turing Machine" that can take ANY program and run it.
Programming languages are similar to those machines (...
Total width of element (including padding and border) in jQuery
...bject, how can one get the total width of an element, including its border and padding, using jQuery? I've got the jQuery dimensions plugin, and running .width() on my 760px-wide , 10px padding DIV returns 760 .
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What is your preferred style for naming variables in R? [closed]
Which conventions for naming variables and functions do you favor in R code?
9 Answers
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