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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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Possible to do a MySQL foreign key to one of two possible tables?
Well here's my problem I have three tables; regions, countries, states. Countries can be inside of regions, states can be inside of regions. Regions are the top of the food chain.
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Ignoring time zones altogether in Rails and PostgreSQL
I'm dealing with dates and times in Rails and Postgres and running into this issue:
2 Answers
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How do function pointers in C work?
I had some experience lately with function pointers in C.
11 Answers
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Performance of foreach, array_map with lambda and array_map with static function
What's the performance difference (if there is any) between these three approaches, both used to transform an array to another array?
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Break a previous commit into multiple commits
Without creating a branch and doing a bunch of funky work on a new branch, is it possible to break a single commit into a few different commits after it's been committed to the local repository?
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ASP.NET Identity's default Password Hasher - How does it work and is it secure?
I am wondering wether the Password Hasher that is default implemented in the UserManager that comes with MVC 5 and ASP.NET Identity Framework, is secure enough? And if so, if you could explain to me how it works?
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What is a lambda expression in C++11?
What is a lambda expression in C++11? When would I use one? What class of problem do they solve that wasn't possible prior to their introduction?
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Build fat static library (device + simulator) using Xcode and SDK 4+
It appears that we can - theoretically - build a single static library that includes both simulator and iPhone and iPad.
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Optional Parameters with C++ Macros
Is there some way of getting optional parameters with C++ Macros? Some sort of overloading would be nice too.
14 Answers
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