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how does multiplication differ for NumPy Matrix vs Array classes?
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The main reason to avoid using the matrix class is that a) it's inherently 2-dimensional, and b) there's additional overhead compared to a "normal" numpy array. If all you're doing is linear algebra, then by all means, feel free t...
使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...可以按照下面的第 1 部分加载提供的源文件 ScaleGestureDemo.aia 来构建演示源应用程序。 要构建应用程序，你需要使用位于 http://extension-test.appinventor.mit.edu 的 App Inventor 测试服务器。 你还需要使用与该实例对应的 AI Companion。 连接...
How to reset db in Django? I get a command 'reset' not found error
... edited May 14 at 12:17
Håken Lid
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answered Aug 30 '13 at 22:06
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What is scope/named_scope in rails?
...ed Feb 2 '11 at 2:17
Michael SchäfermeyerMichael Schäfermeyer
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C++11 std::threads vs posix threads
...hat can be avoided for most applications.
– Erik Alapää
Aug 24 '16 at 8:00
Also, std::thread brings type safety that...
How to set Meld as git mergetool
...ui after you git config (to take a change)
– Yohanes AI
Sep 1 at 10:24
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How to remove the first character of string in PHP?
How to use PHP , Remove the first character :
13 Answers
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What are the differences between Deferred, Promise and Future in JavaScript?
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@MartinKällman You're right! I hadn't revisited this in a while and have learned a bit. I'll post a separate answer below, but leave this since people seem to have benefited from the usage example.
– fncomp
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What's the best way to learn LISP? [closed]
... and C for a couple or years now, and I just finished reading Hackers and Painters, so I would love to give LISP a try!
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Remove Primary Key in MySQL
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Without an index, maintaining an autoincrement column becomes too expensive, that's why MySQL requires an autoincrement column to be a leftmost part of an index.
You should remove the autoincrement property before dropping the key:
ALTER TABL...