大约有 30,000 项符合查询结果（耗时：0.0539秒） [XML]
Check for installed packages before running install.packages() [duplicate]
...
I suggest a more lightweight solution using system.file.
is_inst <- function(pkg) {
nzchar(system.file(package = pkg))
}
is_inst2 <- function(pkg) {
pkg %in% rownames(installed.packages())
}
library(microbenchmark)
microbenchmark(is_inst("aaa"), is_inst2("aaa...
ViewPager and fragments — what's the right way to store fragment's state?
...led when a fragment for that position does not exist. After rotating, Android will notice that it already created/saved a fragment for this particular position and so it simply tries to reconnect with it with FragmentManager.findFragmentByTag(), instead of creating a new one. All of this comes free ...
Return Boolean Value on SQL Select Statement
...eed:
SELECT CASE WHEN EXISTS (
SELECT *
FROM [User]
WHERE UserID = 20070022
)
THEN CAST(1 AS BIT)
ELSE CAST(0 AS BIT) END
share
|
improve this answer
|
follow
...
How do I remove javascript validation from my eclipse project?
...
I actually like MY JavaScript files to be validated, but I definitely don't want to validate and deal with trivial warnings with third party libraries.
That's why I think that turning off validation all together is too drastic. Fortunately with Eclipse,...
Exporting data In SQL Server as INSERT INTO
...n has not very intuitive placement. I supposed that it belongs to "Save to file".
– Karel Kral
Sep 20 '16 at 9:50
add a comment
|
...
Mime type for WOFF fonts?
...
For me, the next has beeen working in an .htaccess file.
AddType font/ttf .ttf
AddType font/eot .eot
AddType font/otf .otf
AddType font/woff .woff
AddType font/woff2 .woff2
share
|
...
How to show only next line after the matched one?
... of the line that contains 'blah' and the next line that follows in the logfile. It might be a simple one but I can't find a way to omit the line that has 'blah' and only show next line in the output.
...
A cron job for rails: best practices?
...
I'm using the rake approach (as supported by heroku)
With a file called lib/tasks/cron.rake ..
task :cron => :environment do
puts "Pulling new requests..."
EdiListener.process_new_messages
puts "done."
end
To execute from the command line, this is just "rake cron". This co...
AngularJS routing without the hash '#'
...
If you enabled html5mode as others have said, and create an .htaccess file with the following contents (adjust for your needs):
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !^(/index\.php|/img|/js|/css|/robots\.txt|/favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
R...
git-upload-pack: command not found, when cloning remote Git repo
...e git in the .bashrc on the remote machine. According to the manpage, .profile/.bash_profile are only read for interactive logins.
– Matt Curtis
Jun 15 '12 at 5:57
...