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How to append rows to an R data frame
...1() (the approach below) is incredibly inefficient because of how often it calls data.frame and because growing objects that way is generally slow in R. f3() is much improved due to preallocation, but the data.frame structure itself might be part of the bottleneck here. f4() tries to bypass that bot...
Why does viewWillAppear not get called when an app comes back from the background?
...
In other words, if someone looks at another application or takes a phone call, then switches back to your app which was earlier on backgrounded, your UIViewController which was already visible when you left your app 'doesn't care' so to speak -- as far as it is concerned, it's never disappeared an...
Asynchronous Requests with Python requests
...each object (your task)
Add that function as an event hook in your request
Call async.map on a list of all the requests / actions
Example:
from requests import async
# If using requests > v0.13.0, use
# from grequests import async
urls = [
'http://python-requests.org',
'http://httpbin...
Best way to define private methods for a class in Objective-C
... you can create a category with an empty name (i.e. @interface MyClass ()) called Class Extension. What's unique about a class extension is that the method implementations must go in the same @implementation MyClass as the public methods. So I structure my classes like this:
In the .h file:
@inter...
How to develop a soft keyboard for Android? [closed]
...d
clone this repo: LatinIME
About your questions:
An inputMethod is basically an Android Service, so yes, you can do HTTP and all the stuff you can do in a Service.
You can open Activities and dialogs from the InputMethod. Once again, it's just a Service.
I've been developing an IME, so ask aga...
Getting the error “Java.lang.IllegalStateException Activity has been destroyed” when using tabs with
...his seems to be a bug in the newly added support for nested fragments. Basically, the child FragmentManager ends up with a broken internal state when it is detached from the activity. A short-term workaround that fixed it for me is to add the following to onDetach() of every Fragment which you call ...
There is already an open DataReader associated with this Command which must be closed first
...check for these repeated data loads can help speed up your data processing calls by reducing round trips.
– Chris Moschini
Dec 15 '12 at 18:11
...
jQuery : eq() vs get()
...stand what the get() function does, but I thought it odd that I couldn't call a function on the returned on the returned element in the same line.
...
Elegant ways to support equivalence (“equality”) in Python classes
...r class A(B):.
For classic-style classes, a comparison operation always calls the method of the first operand, while for new-style classes, it always calls the method of the subclass operand, regardless of the order of the operands.
So here, if Number is a classic-style class:
n1 == n3 calls ...
How to redirect to a 404 in Rails?
...you want to show a 404 page, create a render_404 method (or not_found as I called it) in ApplicationController like this:
def not_found
raise ActionController::RoutingError.new('Not Found')
end
Rails also handles AbstractController::ActionNotFound, and ActiveRecord::RecordNotFound the same way...