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Maintain aspect ratio of div but fill screen width and height in CSS?

I have a site to put together that has a fixed aspect ratio of approximately 16:9 landscape, like a video. 9 Answers ...
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Remove rows with all or some NAs (missing values) in data.frame

I'd like to remove the lines in this data frame that: 16 Answers 16 ...
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What is “2's Complement”?

I'm in a computer systems course and have been struggling , in part, with Two's Complement . I want to understand it but everything I've read hasn't brought the picture together for me. I've read the wikipedia article and various other articles, including my text book . ...
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Count work days between two dates

How can I calculate the number of work days between two dates in SQL Server? 23 Answers ...
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Filter rows which contain a certain string

I have to filter a data frame using as criterion those row in which is contained the string RTB . 4 Answers ...
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What is Weak Head Normal Form?

What does Weak Head Normal Form (WHNF) mean? What does Head Normal form (HNF) and Normal Form (NF) mean? 6 Answers ...
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Why is a pure virtual function initialized by 0?

We always declare a pure virtual function as: 11 Answers 11 ...
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Twitter oAuth callbackUrl - localhost development

Is anyone else having a difficult time getting Twitters oAuth's callback URL to hit their localhost development environment. Apparently it has been disabled recently. http://code.google.com/p/twitter-api/issues/detail?id=534#c1 ...
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Is there a way to iterate over a range of integers?

Go's range can iterate over maps and slices, but I was wondering if there is a way to iterate over a range of numbers, something like this: ...
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How can I convert a DateTime to the number of seconds since 1970?

I'm trying to convert a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001. ...