大约有 5,000 项符合查询结果（耗时：0.0320秒） [XML]
Mean per group in a data.frame [duplicate]
...53 19
Ben 2 22 87
Ben 3 19 45
Cat 1 22 87
Cat 2 67 43
Cat 3 45 32', header=TRUE)
aggregate(d[, 3:4], list(d$Name), mean)
Group.1 Rate1 Rate2
1 Aira 16.33333 47.00000
2 Ben 31.33333 ...
Convert pem key to ssh-rsa format
...u5aSGbUvin3DusYAsl5sZjTf9VZgJHsVycOrtChC1tUi WMAWfv2BLTmK4zBEC33riEBLeX8Trphp3YbIMtzqV81ZrzHZbSnrAgMBAAE= -----END RSA PUBLIC KEY----- it doesn't have a description
– braden
Sep 18 '13 at 19:24
...
Sending HTTP POST Request In Java
....encode( rawData, "UTF-8" );
URL u = new URL("http://www.example.com/page.php");
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty( "Content-Type", type );
conn.setRequestProperty( "Content-Length", String...
What's the difference between a web site and a web application? [closed]
...ites are primarily informational. In this sense, http://cnn.com and http://php.net are websites, not web applications.
Web applications primarily allow the user to perform actions. Google Analytics, gmail, and jslint are web applications.
They are not entirely exclusive. A university website lik...
How do I read the first line of a file using cat?
How do I read the first line of a file using cat ?
10 Answers
10
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Good ways to manage a changelog using git?
...ly the code currently mandates that each client have their own copy of the PHP site; I'm changing this, but it's slow-going).
...
Grep for literal strings
...nothing will be found. So this didn't return any result: grep --include=\*.php -FRn -e "$$" Using single quoutes gave me the wanted result: grep --include=\*.php -FRn -e '$$'
– Piemol
Nov 15 '17 at 13:16
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Finding all objects that have a given property inside a collection [duplicate]
I have some complicated object, such as a Cat, which has many properties, such as age, favorite cat food, and so forth.
2...
Why is reading lines from stdin much slower in C++ than Python?
...wered Feb 21 '12 at 3:24
Vaughn CatoVaughn Cato
58.3k55 gold badges7171 silver badges111111 bronze badges
...
How does “cat
...b character. If you do it right, your syntax highlighting should correctly catch the ending delimiter.
– trkoch
Nov 10 '15 at 17:23
1
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