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Assign multiple columns using := in data.table, by group
What is the best way to assign to multiple columns using data.table ? For example:
2 Answers
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Xcode 4 - slow performance
I have an issue with Xcode 4 really responding very slowly to user interactions, e.g. editing code, scrolling areas etc. This particularly happens with larger scale projects with many controllers/view files etc.
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How to check a string for specific characters?
How can I check if a string has several specific characters in it using Python 2?
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Cartesian product of multiple arrays in JavaScript
How would you implement the Cartesian product of multiple arrays in JavaScript?
30 Answers
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Why aren't superclass __init__ methods automatically invoked?
Why did the Python designers decide that subclasses' __init__() methods don't automatically call the __init__() methods of their superclasses, as in some other languages? Is the Pythonic and recommended idiom really like the following?
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Can I get a list of files marked --assume-unchanged?
What have I marked as --assume-unchanged ? Is there any way to find out what I've tucked away using that option?
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How to prevent XSS with HTML/PHP?
How do I prevent XSS (cross-site scripting) using just HTML and PHP?
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How to validate IP address in Python? [duplicate]
What's the best way to validate that an IP entered by the user is valid? It comes in as a string.
11 Answers
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What is the minimum I have to do to create an RPM file?
I just want to create an RPM file to distribute my Linux binary "foobar", with only a couple of dependencies. It has a config file, /etc/foobar.conf and should be installed in /usr/bin/foobar.
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What is an xs:NCName type and when should it be used?
I ran one of my xml files through a schema generator and everything generated was what was expected, with the exception of one node:
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