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Difference between HEAD and master
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answered Sep 24 '15 at 15:24
benhorgenbenhorgen
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What is the difference between Caching and Memoization?
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edited Oct 20 '19 at 22:41
smci
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answered Jun...
Why is HttpClient BaseAddress not working?
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4 Answers
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Push to GitHub without a password using ssh-key
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If it is asking you for a username and password, your origin remote is pointing at the HTTPS U...
Alter MySQL table to add comments on columns
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answered Jan 29 '10 at 14:18
RufinusRufinus
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How to change field name in Django REST Framework
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edited Apr 19 '19 at 4:27
PatDuJour
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answered Apr 9 '14 at 9:4...
Proper package naming for testing with the Go language
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Do browsers send “\r\n” or “\n” or does it depend on the browser?
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edited Oct 7 '14 at 18:11
answered Jun 12 '11 at 19:38
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How to drop columns by name in a data frame
... function. For example :
R> df <- data.frame(x=1:5, y=2:6, z=3:7, u=4:8)
R> df
x y z u
1 1 2 3 4
2 2 3 4 5
3 3 4 5 6
4 4 5 6 7
5 5 6 7 8
Then you can use the which function and the - operator in column indexation :
R> df[ , -which(names(df) %in% c("z","u"))]
x y
1 1 2
2 2 3
3 3 4...