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Determine the data types of a data frame's columns
I'm using R and have loaded data into a dataframe using read.csv() . How do I determine the data type of each column in the data frame?
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How can I perform a `git pull` without re-entering my SSH password?
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Have a look at this link https://help.github.com/articles/working-with-ssh-key-passphrases/
But I don’t want to enter a long passphrase every time I use the key!
Neither do I! Thankfully, there’s a nifty little tool called
ssh-agent th...
Overflow to left instead of right
...you tried using the following:
direction: rtl;
For more information see
http://www.w3schools.com/cssref/pr_text_direction.asp
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Javascript add leading zeroes to date
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Try this: http://jsfiddle.net/xA5B7/
var MyDate = new Date();
var MyDateString;
MyDate.setDate(MyDate.getDate() + 20);
MyDateString = ('0' + MyDate.getDate()).slice(-2) + '/'
+ ('0' + (MyDate.getMonth()+1)).slice(-2) + ...
Reason to Pass a Pointer by Reference in C++?
Under which circumstances would you want to use code of this nature in c++?
6 Answers
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C++ unordered_map using a custom class type as the key
... Compute individual hash values for first, second and third
// http://stackoverflow.com/a/1646913/126995
size_t res = 17;
res = res * 31 + hash<string>()( k.first );
res = res * 31 + hash<string>()( k.second );
res = res * 31 + ...
Compile time string hashing
I have read in few different places that using C++11's new string literals it might be possible to compute a string's hash at compile time. However, no one seems to be ready to come out and say that it will be possible or how it would be done.
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Send string to stdin
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Download data url file
...nload", filename);
a.click();
}
);
});
}
download("https://get.geojs.io/v1/ip/geo.json","geoip.json")
download("data:text/html,HelloWorld!", "helloWorld.txt");
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Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
... #python3 don't have this attribute.
#not suggest even in python2 #see:http://stackoverflow.com/questions/3828723/why-should-we-not-use-sys-setdefaultencodingutf-8-in-a-py-script
#2.overwrite /usr/lib/python2.7/sitecustomize.py or (sitecustomize.py and PYTHONPATH=".:$PYTHONPATH" python)
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