大约有 47,000 项符合查询结果（耗时：0.0403秒） [XML]
Sleep until a specific time/date
...bash, do the following:
current_epoch=$(date +%s)
target_epoch=$(date -d '01/01/2010 12:00' +%s)
sleep_seconds=$(( $target_epoch - $current_epoch ))
sleep $sleep_seconds
To add precision down to nanoseconds (effectively more around milliseconds) use e.g. this syntax:
current_epoch=$(date +%s.%...
What is 'Pattern Matching' in functional languages?
...
edited May 23 '17 at 12:10
Community♦
111 silver badge
answered Mar 23 '10 at 18:58
...
random.seed(): What does it do?
...ues / bugs.
– ViFI
Apr 25 '17 at 6:20
1
Following what @ViFI said, keeping program behavior deter...
Calculate the center point of multiple latitude/longitude coordinate pairs
...ing them has weird edge cases with angles when they wrap from 359' back to 0'.
A much earlier question on SO asked about finding the average of a set of compass angles.
An expansion of the approach recommended there for spherical coordinates would be:
Convert each lat/long pair into a unit-lengt...
How to parse a CSV file using PHP [duplicate]
...
201
Just use the function for parsing a CSV file
http://php.net/manual/en/function.fgetcsv.php
$r...
Generate a random double in a range
...|
edited Sep 27 '15 at 18:03
answered Sep 9 '10 at 21:17
mo...
Histogram using gnuplot?
...x,width)=width*floor(x/width)
plot 'datafile' using (bin($1,binwidth)):(1.0) smooth freq with boxes
check out help smooth freq to see why the above makes a histogram
to deal with ranges just set the xrange variable.
share...
getMinutes() 0-9 - How to display two digit numbers?
...
20 Answers
20
Active
...
Context switches much slower in new linux kernels
We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to belie...
How to clear the canvas for redrawing
...
const context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
share
|
improve this answer
|
follow
|
...