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Summarizing multiple columns with dplyr? [duplicate]
I'm struggling a bit with the dplyr-syntax. I have a data frame with different variables and one grouping variable. Now I want to calculate the mean for each column within each group, using dplyr in R.
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Why do Java programmers like to name a variable “clazz”? [closed]
...en lots of codes have declaration like Class clazz , where does this originate from ? Is this some kind of convention ? I think 'clazz' is not even an English word , has no meaning at all , how can so many programmers name a wrong name coincidentally ?
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Refreshing OAuth token using Retrofit without modifying all calls
We are using Retrofit in our Android app, to communicate with an OAuth2 secured server. Everything works great, we use the RequestInterceptor to include the access token with each call.
However there will be times, when the access token will expire, and the token needs to be refreshed. When the toke...
How to flip windows in vim? [duplicate]
If I have 2 horizontally split windows, how to rotate them to get 2 vertically split windows?
4 Answers
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How to vertically center content with variable height within a div?
...y center the content of a div when the height of the content is variable. In my particular case, the height of the container div is fixed, but it would be great if there were a solution that would work in cases where the container has a variable height as well. Also, I would love a solution with no...
Mac OSX Lion DNS lookup order [closed]
After upgrading to Mac OSX Lion I figured out that /etc/hosts is not looked up in first place for name resolution anymore. This leads to some side effects like:
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What is the Simplest Way to Reverse an ArrayList?
...;
aList.add("4");
aList.add("5");
Collections.reverse(aList);
System.out.println("After Reverse Order, ArrayList Contains : " + aList);
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How to define static property in TypeScript interface
I just want to declare a static property in typescript interface? I have not found anywhere regarding this.
13 Answers
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Get Element value with minidom with Python
I am creating a GUI frontend for the Eve Online API in Python.
9 Answers
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How do I get my C# program to sleep for 50 msec?
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System.Threading.Thread.Sleep(50);
Remember though, that doing this in the main GUI thread will block your GUI from updating (it will feel "sluggish")
Just remove the ; to make it work for VB.net as well.
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