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How to make a great R reproducible example
...n datasets can be seen with library(help = "datasets"). There is a short description to every dataset and more information can be obtained for example with ?mtcars where 'mtcars' is one of the datasets in the list. Other packages might contain additional datasets.
Making a vector is easy. Sometime...
How can I check if a command exists in a shell script? [duplicate]
I am writing my first shell script. In my script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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pythonw.exe or python.exe?
...s:
python.exe is a console (terminal) application for launching CLI-type scripts.
Unless run from an existing console window, python.exe opens a new console window.
Standard streams sys.stdin, sys.stdout and sys.stderr are connected to the console window.
Execution is synchronous when launched f...
Email validation using jQuery
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You can use regular old javascript for that:
function isEmail(email) {
var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
return regex.test(email);
}
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Explanation of [].slice.call in javascript?
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In JavaScript, methods of an object can be bound to another object at runtime. In short, javascript allows an object to "borrow" the method of another object:
object1 = {
name: 'Frank',
greet() {
alert(`Hello ${this...
Fast way of finding lines in one file that are not in another?
...gh you can use <(sort ...) to sort in place. Here's a simple awk (nawk) script (inspired by the scripts linked-to in Konsolebox's answer) which accepts arbitrarily ordered input files, and outputs the missing lines in the order they occur in file1.
# output lines in file1 that are not in file2
B...
Installing python module within code
I need to install a package from PyPi straight within my script.
Maybe there's some module or distutils ( distribute , pip etc.) feature which allows me to just execute something like pypi.install('requests') and requests will be installed into my virtualenv.
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Is it possible to use JS to open an HTML select to show its option list? [duplicate]
Is it possible to use JavaScript to open an HTML select to show its option list?
11 Answers
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How to create a JavaScript callback for knowing when an image is loaded?
... I guess it would only be an issue for parallel code, which most javascript probably isn't..
– Thomas Ahle
Jan 10 '17 at 21:20
4
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Setting Curl's Timeout in PHP
... //timeout in seconds
also don't forget to enlarge time execution of php script self:
set_time_limit(0);// to infinity for example
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