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Limit a stream by a predicate
... gotten a much bigger performamce boost, without bothering the developers. Now that is automagical parallelism done right.
– Aleksandr Dubinsky
Dec 25 '13 at 20:24
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How to run only one task in ansible playbook?
... role/stuff/tasks/main.yml
- name: do stuff
when: stuff|default(false)
Now, this task will not fire by default, but only if I set the stuff=true
$ ansible-playbook -e '{"stuff":true}'
or in a playbook:
roles:
- {"role":"stuff", "stuff":true}
...
How to change the session timeout in PHP?
...ther with the rest of the session data:
session_start(); // ready to go!
$now = time();
if (isset($_SESSION['discard_after']) && $now > $_SESSION['discard_after']) {
// this session has worn out its welcome; kill it and start a brand new one
session_unset();
session_destroy()...
How to select a CRAN mirror in R
...rg"
options(repos=r)
})
which is in ~/.Rprofile.
Edit: As it is now 2018, we can add that for the last few years the URL "https://cloud.r-project.org" has been preferable as it reflects a) https access and b) an "always-near-you" CDN.
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Convert a list to a data frame
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Update July 2020:
The default for the parameter stringsAsFactors is now default.stringsAsFactors() which in turn yields FALSE as its default.
Assuming your list of lists is called l:
df <- data.frame(matrix(unlist(l), nrow=length(l), byrow=T))
The above will convert all character columns...
How to clear basic authentication details in chrome
... basic authentication. Using Chrome I've logged in using the basic auth. I now want to remove the basic authentication details from the browser and try a different login.
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Read url to string in few lines of java code
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Now that some time has passed since the original answer was accepted, there's a better approach:
String out = new Scanner(new URL("http://www.google.com").openStream(), "UTF-8").useDelimiter("\\A").next();
If you want a s...
Short circuit Array.forEach like calling break
...
There is now an even better way to do this in ECMAScript2015 (aka ES6) using the new for of loop. For example, this code does not print the array elements after the number 5:
let arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
for (le...
Installing Bower on Ubuntu
...odejs
When this has installed, check the version:
npm --version
1.4.3
Now install Bower:
sudo npm install -g bower
This will fetch and install Bower globally.
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Get the current time in C
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I know it's probably a bit late and you have likely figured it out by now, but you would use the strptime function in time.h to convert from char * to struct tm
– KingRadical
Nov 5 '13 at 1...