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How to check if object (variable) is defined in R?

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Grep characters before and after match?

... 3 characters before and 4 characters after $> echo "some123_string_and_another" | grep -o -P '.{0,3}string.{0,4}' 23_string_and share |...
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Error when testing on iOS simulator: Couldn't register with the bootstrap server

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Handling applicationDidBecomeActive - “How can a view controller respond to the app becoming Active?

... 305 Any class in your application can become an "observer" for different notifications in the appl...
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How can I connect to MySQL in Python 3 on Windows?

I am using ActiveState Python 3 on Windows and wanted to connect to my MySQL database. I heard that mysqldb was the module to use. I can't find mysqldb for Python 3. ...
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Get selected element's outer HTML

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Was PreferenceFragment intentionally excluded from the compatibility package?

I'm looking to write preferences that can be applied to both 3.0 and pre-3.0 devices. Discovering that PreferenceActivity contains deprecated methods (although these are used in the accompanying sample code), I looked at PreferenceFragement and the compatibility package to solve my woes. ...
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Convert Month Number to Month Name Function in SQL

I have months stored in SQL Server as 1,2,3,4,...12. I would like to display them as January,February etc. Is there a function in SQL Server like MonthName(1) = January? I am trying to avoid a CASE statement, if possible. ...
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Codesign error: Certificate identity appearing twice

CodeSign error: Certificate identity 'iPhone Developer: XXXX (12345678)' appears more than once in the keychain. The codesign tool requires there only be one. ...
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How to get an object's property's value by property name?

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