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Extracting the last n characters from a string in R
... Would it be more efficient to avoid calling nchar(x) twice by assigning it to a local variable?
– Dave Jarvis
Aug 12 '17 at 3:24
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How to tell which colorscheme a Vim session currently uses
You can set the Vim color scheme by issuing
3 Answers
3
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XPath query to get nth instance of an element
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This is a FAQ:
//somexpression[$N]
means "Find every node selected by //somexpression that is the $Nth child of its parent".
What you want is:
(//input[@id="search_query"])[2]
Remember: The [] operator has higher precedence (priority) than the // abbreviation.
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How do I view the SQLite database on an Android device? [duplicate]
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Here are step-by-step instructions (mostly taken from a combination of the other answers). This works even on devices that are not rooted.
Connect your device and launch the application in debug mode.
You may want to use adb -d shell "ru...
How can I view the shared preferences file using Android Studio?
...on menu next to green arrow 6. On your PC open latest Chrome browser 7. go by chrome://inspect address 8. chose your emulator in list. 9. In opened window go to Resources tab. 10. Find your shared preferences under LocalStorage menu on the left side. 11. In application play with boolean flag
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How to remove a project (from the workspace) in PHPStorm?
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Follow this simple steps:
Just close project by using file menu.
Select project name from Recent Projects at left side panel by using up/down arrow keys.
Now just press Del key on keyboard.
sha...
ASP.NET: This method cannot be called during the application's pre-start initialization stage
... This fixed it for me when I upgraded from MVC4RC to RTM. I started out by making a fresh project and copying over all the related bits. I made no code changes, and the web.config had no significant changes either. Strange.
– Andrew Backer
Nov 8 '12 at 10:...
What exactly are “spin-locks”?
... etc), operating system puts your thread in the WAIT state and preempts it by scheduling other threads on the same core. This has a performance penalty if the wait time is really short, because your thread now has to wait for a preemption to receive CPU time again.
Besides, kernel objects are not av...
How do you get a query string on Flask?
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We can do this by using request.query_string.
Example:
Lets consider view.py
from my_script import get_url_params
@app.route('/web_url/', methods=('get', 'post'))
def get_url_params_index():
return Response(get_url_params())
You a...
When should I use git pull --rebase?
I know of some people who use git pull --rebase by default and others who insist never to use it. I believe I understand the difference between merging and rebasing, but I'm trying to put this in the context of git pull . Is it just about not wanting to see lots of merge commit messages, or are...