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How to form tuple column from two columns in Pandas
I've got a Pandas DataFrame and I want to combine the 'lat' and 'long' columns to form a tuple.
4 Answers
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How does MongoDB sort records when no sort order is specified?
...ementation detail. Maintaining order is extra overhead for storage engines and MongoDB's API does not mandate predictability outside of an explicit sort() or the special case of fixed-sized capped collections which have associated usage restrictions. For typical workloads it is desirable for the sto...
unable to install pg gem
... me:
Install the postgresql-devel package, this will solve the issue of pg_config missing.
sudo apt-get install libpq-dev
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嵌套块验证失败：未知的代码块类型: procedures_ifreturn，已拒绝添加 - AI...
...块视图
✗ 嵌套块验证失败：未知的代码块类型: procedures_ifreturn，已拒绝添加
✓ 代码块已整理
[
{
"action": "SWITCH_TO_BLOCKS"
},
{
"action": "ADD_BLOCK"...
Using Jasmine to spy on a function without an object
I'm new to Jasmine and have just started using it. I have a library js file with lots of functions which are not associated with any object (i.e. are global). How do I go about spying on these functions?
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Why does Math.round(0.49999999999999994) return 1?
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Summary
In Java 6 (and presumably earlier), round(x) is implemented as floor(x+0.5).1 This is a specification bug, for precisely this one pathological case.2 Java 7 no longer mandates this broken implementation.3
The problem
0.5+0.49999999...
Multiple line code example in Javadoc comment
I have a small code example I want to include in the Javadoc comment for a method.
15 Answers
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Applications are expected to have a root view controller at the end of application launch
... make sure self.window is initialized like self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
– Raptor
Feb 13 '12 at 12:07
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Where can I get a “useful” C++ binary search algorithm?
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I don't really understand your comment, since lower_bound can only be used on sorted data. Complexity is lower than using find (see edit).
– Luc Touraille
Jan 15 '09 at 11:02
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Setting action for back button in navigation controller
...igning it though the backbutton attribute it doesn't pay attention to them and it just pops the current view and goes back to the root:
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