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Reorder levels of a factor without changing order of values
I have data frame with some numerical variables and some categorical factor variables. The order of levels for those factors is not the way I want them to be.
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Very simple log4j2 XML configuration file using Console and File appender
I'd like a very simple XML configuration file with a console and a file appender using log4j2.
4 Answers
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Check if at least two out of three booleans are true
...ewer recently asked me this question: given three boolean variables, a, b, and c, return true if at least two out of the three are true.
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How to send a command to all panes in tmux?
...s with a huge scrollback. However, I want to script a way to send this command to all the panes in the various windows.
7 A...
Linq: adding conditions to the where clause conditionally
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If you do not call ToList() and your final mapping to the DTO type, you can add Where clauses as you go, and build the results at the end:
var query = from u in DataContext.Users
where u.Division == strUserDiv
&& u.Age > 18
&&a...
Golang production web application configuration
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Go programs can listen on port 80 and serve HTTP requests directly. Instead, you may want to use a reverse proxy in front of your Go program, so that it listens on port 80 and and connects to your program on port, say, 4000. There are many reason for doing th...
Adding a Method to an Existing Object Instance
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In Python, there is a difference between functions and bound methods.
>>> def foo():
... print "foo"
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>>> class A:
... def bar( self ):
... print "bar"
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>>> a = A()
>>> foo
<function foo at 0x00A98D70>
>>&g...
How do I add a linker or compile flag in a CMake file?
I am using the arm-linux-androideabi-g++ compiler. When I try to compile a simple "Hello, World!" program it compiles fine. When I test it by adding a simple exception handling in that code it works too (after adding -fexceptions .. I guess it is disabled by default).
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Make an existing Git branch track a remote branch?
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Given a branch foo and a remote upstream:
As of Git 1.8.0:
git branch -u upstream/foo
Or, if local branch foo is not the current branch:
git branch -u upstream/foo foo
Or, if you like to type longer commands, these are equivalent to the above...
How to secure RESTful web services?
... so they know the client is who they say they are. Clients generate certs and give them to you over a secure channel (like coming into your office with a USB key - preferably a non-trojaned USB key).
You load the public key of the cert client certificates (and their signer's certificate(s), if nec...