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Regex group capture in R with multiple capture-groups
...lt;- character(0)
if (attr(match, 'match.length') >= 0) {
capture_start <- attr(match, 'capture.start')
capture_length <- attr(match, 'capture.length')
total_matches <- 1 + length(capture_start)
matches <- character(total_matches)
matches[1] <- substr(str, mat...
Postgres could not connect to server
...
Had a similar problem; a pid file was blocking postgres from starting up. To fix it:
$ rm /usr/local/var/postgres/postmaster.pid
$ brew services restart postgresql
and then all is well.
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python multithreading wait till all threads finished
...umentsB))
t3 = Thread(target=call_script, args=(scriptA + argumentsC))
t1.start()
t2.start()
t3.start()
t1.join()
t2.join()
t3.join()
Thus the main thread will wait till t1, t2 and t3 finish execution.
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How to make a Python script run like a service or daemon in Linux
...un query 60 times, which means it ends after 50 seconds, and then let cron start the script again 10 seconds later?
– Mads Skjern
Mar 10 '16 at 10:29
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Get first day of week in SQL Server
...ut rather a Sunday. For example:
DECLARE @dt DATE = '1905-01-01';
SELECT [start_of_week] = DATEADD(WEEK, DATEDIFF(WEEK, @dt, CURRENT_TIMESTAMP), @dt);
This will not break if you change your DATEFIRST setting (or your code is running for a user with a different setting) - provided that you still w...
How to open in default browser in C#
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You can just write
System.Diagnostics.Process.Start("http://google.com");
EDIT: The WebBrowser control is an embedded copy of IE.
Therefore, any links inside of it will open in IE.
To change this behavior, you can handle the Navigating event.
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Number of days between two dates in Joda-Time
... Joda-Time DateTime instances?
With ‘difference in days’ I mean if start is on Monday and end is on Tuesday I expect a return value of 1 regardless of the hour/minute/seconds of the start and end dates.
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How to calculate time elapsed in bash script?
I print the start and end time using date +"%T" , which results in something like:
20 Answers
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Couldn't connect to server 127.0.0.1:27017
...nd were not running with journaling, remove the lock file, run repair, and start mongodb again.
If you are or were running with journaling turned on, see the relevant Mongo DB docs. Note that they say "If you are running with Journaling you should not do a repair to recover to a consistent state." ...
Representing and solving a maze given an image
...reshold. In fact, all interior points of this maze are accessible from the start.
Add artificial borders on the maze to make sure virtual traveler will not walk around it :)
Implement breadth-first search (BFS) in your favorite language and run it from the start. I prefer MATLAB for this task. As @T...