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R command for setting working directory to source file location in Rstudio
...orials in R. Each R code is contained in a specific folder. There are data files and other files in there. I want to open the .r file and source it such that I do not have to change the working directory in Rstudio as shown below:
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git recover deleted file where no commit was made after the delete
I deleted some files.
22 Answers
22
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Is SQL or even TSQL Turing Complete?
...e true programming languages, so that's kinda cheating).
In this set of slides Andrew Gierth proves that with CTE and Windowing SQL is Turing Complete, by constructing a cyclic tag system, which has been proved to be Turing Complete. The CTE feature is the important part however -- it allows you to...
How can I have ruby logger log output to stdout as well as file?
...close
@targets.each(&:close)
end
end
Then set that as your log file:
log_file = File.open("log/debug.log", "a")
Logger.new MultiIO.new(STDOUT, log_file)
Every time Logger calls puts on your MultiIO object, it will write to both STDOUT and your log file.
Edit: I went ahead and figured...
How to use sed to remove the last n lines of a file
I want to remove some n lines from the end of a file. Can this be done using sed?
22 Answers
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UPDATE multiple tables in MySQL using LEFT JOIN
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UPDATE t1
LEFT JOIN
t2
ON t2.id = t1.id
SET t1.col1 = newvalue
WHERE t2.id IS NULL
Note that for a SELECT it would be more efficient to use NOT IN / NOT EXISTS syntax:
SELECT t1.*
FROM t1
WHERE t1.id NOT IN
(
SELECT id
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git command to move a folder inside another
I have created a folder common with a bunch of source files and folders.
9 Answers
9...
Bootstrap trying to load map file. How to disable it? Do I need to do it?
...ect. The thing is, I see in GH dev tools, that it's trying to get .map.css file. Why does it want to do so? How to disable it? Do I need to disable it? To not to have an error mark in dev tools, I added that map file, after which all styles are displayed as they defined in less files, which doesn't ...
For homebrew mysql installs, where's my.cnf?
...or the conf locations listed.
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf
The following groups are read: mysql client
The following options may be given as the first argument:
--print-defaults Print the progra...
How to build an APK file in Eclipse?
When I develop the project using Eclipse , the APK file goes on the emulator. But I want to upload my application to a real device. Is there a tool to build an APK file?
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