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Is there a portable way to print a message from the C preprocessor?

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Concatenating two one-dimensional NumPy arrays

I have two simple one-dimensional arrays in NumPy . I should be able to concatenate them using numpy.concatenate . But I get this error for the code below: ...
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Emulate ggplot2 default color palette

What function can I use to emulate ggplot2's default color palette for a desired number of colors. For example, an input of 3 would produce a character vector of HEX colors with these colors: ...
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Take all my changes on the current branch and move them to a new branch in Git

I started work on what I thought would be a minor bug fix on my master branch. However, it has spiraled out of control to the point where I wish I had created a separate branch to do the development in the first place. ...
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Ruby/Rails: converting a Date to a UNIX timestamp

How would I get a UNIX timestamp (number of seconds since 1970 GMT) from a Date object in a Rails app? 5 Answers ...
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How is the AND/OR operator represented as in Regular Expressions?

I'm currently programming a vocabulary algorithm that checks if a user has typed in the word correctly. I have the following situation: The correct solution for the word would be "part1, part2". The user should be able to enter either "part1" (answer 1), "part2" (answer 2) or "part1, part2" (answer ...
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How to find the size of an array in postgresql

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How to quit scala 2.11.0 REPL?

In the last version of scala (2.10.3) REPL, I can type exit to quit from REPL. However, in Scala 2.11.0 this doesn't work. ...
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Unable to hide welcome screen in Emacs

I want to hide the welcome screen. 6 Answers 6 ...
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How to manually deprecate members

Unlike Objective-C, Swift has no preprocessor, so is there still a way to manually deprecate members of a class? 4 Answers ...