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How to wait for a keypress in R?
...olePrompt = "[click on graph then follow top prompt to continue]")
Sys.sleep(0.01)
return(keyPressed)
}
onKeybd <- function(key)
{
keyPressed <<- key
}
xaxis=c(1:10) # Set up the x-axis.
yaxis=runif(10,min=0,max=1) # Set up the y-axis.
plot(xaxis,yaxis)
for (i in xaxis)
{
...
Is there a performance gain in using single quotes vs double quotes in ruby?
...ent story, of course. 'foo' will be almost exactly 1 second faster than "#{sleep 1; nil}foo".
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$(document).ready equivalent without jQuery
...('DOMContentLoaded', function() {
console.log('document is ready. I can sleep now');
});
Concerned about stone age browsers:
Go to the jQuery source code and use the ready function. In that case you are not parsing+executing the whole library you're are doing only a very small part of it.
...
What is the need of JSF, when UI can be achieved with JavaScript libraries such as jQuery and Angula
... thing with powerful control over HTML.
– Plain_Dude_Sleeping_Alone
Jul 19 '15 at 21:29
add a...
How to use shared memory with Linux in C
...te: %s\n", shmem);
} else {
printf("Parent read: %s\n", shmem);
sleep(1);
printf("After 1s, parent read: %s\n", shmem);
}
}
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Increasing the maximum number of TCP/IP connections in Linux
...me reason, I could not add more than 28230 sessions without adding lots of sleep in one go, with no errors seen either in php or on redis logs. We broke our heads on this for an entire day till I thought maybe problem is not with php/redis but in the tcp/ip layer connecting the two and came to this ...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...m -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}
# do stuff
sleep 1000
rm -f ${LOCKFILE}
The trick here is the kill -0 which doesn't deliver any signal but just checks if a process with the given PID exists. Also the call to trap will ensure that the lockfile is removed even when ...
How can I do division with variables in a Linux shell?
...y find useful:
start=`date +%s`
# ... do something that takes a while ...
sleep 71
end=`date +%s`
let deltatime=end-start
let hours=deltatime/3600
let minutes=(deltatime/60)%60
let seconds=deltatime%60
printf "Time spent: %d:%02d:%02d\n" $hours $minutes $seconds
Another simple example - calculat...
How to make Java honor the DNS Caching Timeout?
....printStackTrace();
}
try {
Thread.sleep(5L*1000L);
} catch(Exception ex) {}
i++;
}
}
public static void displayStuff(String whichHost, InetAddress inetAddress) {
System.out.println("Which Host:" + whichHost);
...
How to get duration, as int milli's and float seconds from ?
...in()
{
auto then = std::chrono::system_clock::now();
std::this_thread::sleep_for(std::chrono::seconds(1));
auto now = std::chrono::system_clock::now();
auto dur = now - then;
typedef std::chrono::duration<float> float_seconds;
auto secs = std::chrono::duration_cast<float_seconds...