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ggplot2 keep unused levels barplot

I want to plot unused levels (that is, levels where the count is 0) in my bar-plot, however, unused levels are dropped and I cannot figure out how to keep them ...
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Converting between java.time.LocalDateTime and java.util.Date

Java 8 has a completely new API for date and time. One of the most useful classes in this API is LocalDateTime , for holding a timezone-independent date-with-time value. ...
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Why are these constructs using pre and post-increment undefined behavior?

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How to avoid passing parameters everywhere in play2?

In play1, I usually get all data in actions, use them directly in views. Since we don't need to explicitly declare parameters in view, this is very easy. ...
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Android: ProgressDialog.show() crashes with getApplicationContext

I can't seem to grasp why this is happening. This code: 18 Answers 18 ...
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How do you properly determine the current script directory in Python?

I would like to see what is the best way to determine the current script directory in Python. 11 Answers ...
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Return XML from a controller's action in as an ActionResult?

What is the best way to return XML from a controller's action in ASP.NET MVC? There is a nice way to return JSON, but not for XML. Do I really need to route the XML through a View, or should I do the not-best-practice way of Response.Write-ing it? ...
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Using “super” in C++

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Create an Android Jar library for distribution

I know of Android Library projects, which allow you to create a shared-source project that can be pulled into Android Applications as needed. However, that requires that source be available. ...
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How to continue a task when Fabric receives an error

When I define a task to run on several remote servers, if the task runs on server one and exits with an error, Fabric will stop and abort the task. But I want to make fabric ignore the error and run the task on the next server. How can I make it do this? ...