大约有 15,000 项符合查询结果（耗时：0.0418秒） [XML]
Is there a bash command which counts files?
...names with spaces, newlines, or control characters in them
file names that start with hyphens (imagine a file called -l)
hidden files, that start with a dot (if the glob was *.log instead of log*
directories that match the glob (e.g. a directory called logs that matches log*)
empty directories (i.e....
Extract a regular expression match
...hat are missing:
library(stringr)
str_locate("aaa12xxx", "[0-9]+")
# start end
# [1,] 4 5
str_extract("aaa12xxx", "[0-9]+")
# [1] "12"
share
|
improve this answer
|
...
in Ipython notebook / Jupyter, Pandas is not displaying the graph I try to plot
...ated please see the current accepted answer
Ok, It seems the answer is to start ipython notebook with --pylab=inline.
so ipython notebook --pylab=inline
This has it do what I saw earlier and what I wanted it to do.
Sorry about the vague original question.
...
How do I write unit tests in PHP? [closed]
...
I think you mentioned a great post. Starting your answer with 'Unit testing isn't very effective' almost caused me to downvote, though, being a test-adept... Possibly, rephrasing in a positive manner would encourage people to read the article.
...
What is the difference between .yaml and .yml extension? [duplicate]
...erring. More likely, this resulted from the fact that three (3) characters starting with "Y" is sufficiently clear, since few extensions start with "Y."
– MarkDBlackwell
Aug 3 '16 at 22:59
...
What are the uses of the exec command in shell scripts? [closed]
...gram in /etc/passwd, but maybe we want environment setting to be used from start-up files. So, in (say) .profile, the last statement says something like:
exec appln-program
so now there is no shell to go back to. Even if appln-program crashes, the end-user cannot get to a shell, because it is ...
What is the use of the @ symbol in PHP?
... use the @ operator for error supression, you have no clue at all where to start when an error occurs. I already had some "fun" with legacy code where some developers used the @ operator quite often. Especially in cases like file operations, network calls, etc. Those are all cases where lots of deve...
Using Custom Domains With IIS Express
...port :80, make sure Skype isn't using port 80, etc.)
Optionally: Set the Start URL to http://dev.example.com
Open %USERPROFILE%\My Documents\IISExpress\config\applicationhost.config (Windows XP, Vista, and 7) and edit the site definition in the <sites> config block to be along the lines of ...
Git cherry pick vs rebase
I have recently started working with Git.
6 Answers
6
...
Extracting numbers from vectors of strings
...
How about
# pattern is by finding a set of numbers in the start and capturing them
as.numeric(gsub("([0-9]+).*$", "\\1", years))
or
# pattern is to just remove _years_old
as.numeric(gsub(" years old", "", years))
or
# split by space, get the element in first index
as.numeric(s...