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Drop unused factor levels in a subsetted data frame

I have a data frame containing a factor . When I create a subset of this dataframe using subset or another indexing function, a new data frame is created. However, the factor variable retains all of its original levels, even when/if they do not exist in the new dataframe. ...
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How can I “unuse” a namespace?

...nt system (Codegear C++Builder) is that some of the auto-generated headers insist on having... 7 Answers ...
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How to simulate Server.Transfer in ASP.NET MVC?

In ASP.NET MVC you can return a redirect ActionResult quite easily : 14 Answers 14 ...
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SQL Server reports 'Invalid column name', but the column is present and the query works through mana

...asse. I have a query that is generated by some C# code. The query works fine in Microsoft SQL Server Management Studio when run against the same database. ...
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How to create a remote Git repository from a local one?

... I think you make a bare repository on the remote side, git init --bare, add the remote side as the push/pull tracker for your local repository (git remote add origin URL), and then locally you just say git push origin master. Now...
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Spring Boot: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFa

I am totally new to Spring and started to do the official guides from this site: https://spring.io/guides 27 Answers ...
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Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.

Let's say I have the following data.table in R : 3 Answers 3 ...
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Could not locate Gemfile

I'm certainly no Ruby developer but I have an application on my server using Ruby, Gems, and Bundler. I am trying to install another Ruby on under a different user account but on the same VPS. When I go to run ...
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SetUnhandledExceptionFilter and the C/C++ Runtime Library - C/C++ - 清泛网移动版 - 专注IT技能提升

...nhandledExceptionFilter to work with the CRT.Download source code - 30.9 KBInt...This article presents a fix for SetUnhandledExceptionFilter to work with the CRT. Download source code - 30.9 KB Introduction Windows provides a way for applications to override the default application "crash" ...
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SetUnhandledExceptionFilter and the C/C++ Runtime Library - C/C++ - 清泛网移动版 - 专注IT技能提升

...nhandledExceptionFilter to work with the CRT.Download source code - 30.9 KBInt...This article presents a fix for SetUnhandledExceptionFilter to work with the CRT. Download source code - 30.9 KB Introduction Windows provides a way for applications to override the default application "crash" ...