大约有 43,000 项符合查询结果（耗时：0.0607秒） [XML]
Sample random rows in dataframe
...356774 -0.1640883
9 -0.3983045 0.7157506
10 -0.9060305 2.3234110
Then select some rows at random:
> df[sample(nrow(df), 3), ]
X1 X2
9 -0.3983045 0.7157506
2 -1.1334614 -0.1973846
10 -0.9060305 2.3234110
...
Sending a mail from a linux shell script
...install/configure and you're on Ubuntu: sudo apt-get install mailutils and select Internet site: Mail is sent and received directly using SMTP..
– user1717828
Dec 15 '17 at 17:48
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Using different Web.config in development and production environment
... test, staging and production) we developed a system where the application selected the appropriate configuration based on the machine name it was deployed to.
This worked for us because:
administrators could deploy applications without involving developers (a requirement) and without having to f...
Compare two MySQL databases [closed]
...
All the tools mentioned look good. I am selecting Toad arbitrarily for now until I could conduct some more research.
– Vincent Ramdhanie
Oct 22 '08 at 14:25
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Visual Studio Clicking Find Results Opens Code in Wrong Window
...cking the Find Results window using the very bottom of the window position selectors.
The files open in the same position as the Find Results when the window is docked in the positions immediately next to the centre position.
...
How to discard local changes in an SVN checkout?
...ore git commit
$ git add -p
<interactively select (and edit) the chunks you want to share>
$ git add ${the_list_of_files_not_in_yet_in_svn_you_want_to_add}
$ git commit
Using the commit, prepare a patch that you want to share. For this purpose, you could also use ...
Use Font Awesome Icon As Favicon
...will display on Safari's pinned tabs and also regular tabs if the user has selected the "Show website icons in tabs" option.
Example HTML for a color bookmark icon:
<head>
<link rel=mask-icon href=https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.14/svgs/solid/rocket.svg color...
Selectors in Objective-C?
First, I'm not sure I really understand what a selector is. From my understanding, it's the name of a method, and you can assign it to a class of type 'SEL' and then run methods such as respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation?
...
In eclipse, unable to reference an android library project in another android project
...on of this 'Is Library' checkbox. It's not intuitive that this is actually selecting the target of the current app/library build and not an option switch for the libraries to be included.
– EtienneSky
May 16 '12 at 6:42
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Find JavaScript function definition in Chrome
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I couldn't find "function definition" using the selected answer. I have searched on Google and couldn't find any help. (Using Chrome Version 41.0.2272.118 m )
– Web_Developer
Apr 13 '15 at 7:17
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