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How do I make a matrix from a list of vectors in R?
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simplify2array is a base function that is fairly intuitive. However, since R's default is to fill in data by columns first, you will need to transpose the output. (sapply uses simplify2array, as documented in help(sapply).)
> t(simplify2arra...
What is two way binding?
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And with Firebase comes... 3-way databinding -> View, Model, Database. Just thought that was pretty neat.
– Levi Fuller
Jun 16 '16 at 2:52
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What's the fastest way to delete a large folder in Windows?
...r /s/q foldername
This is nearly three times faster than a single rmdir, based on time tests with a Windows XP encrypted disk, deleting ~30GB/1,000,000 files/15,000 folders: rmdir takes ~2.5 hours, del+rmdir takes ~53 minutes. More info at Super User.
This is a regular task for me, so I usually ...
Can jQuery provide the tag name?
...nd jQuery itself do not have a either a nodeName function or property. But based on the respondent who first mentioned about this nodeName stuff, this is how I was able to resolve the problem:
this.attr("id", "rnd" + this.attr("nodeName") + "_" + i.toString());
NOTE: this here is a jQuery object....
Remove/hide a preference from the screen
...n some cases i need completely hide one of the preferences from the screen based on my app state. There is a setEnabled method, but it's not exactly what i want. I want to remove that preference from the screen completely.
Is it possible ?
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What exactly does a jar file contain?
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JAR stands for Java ARchive. It's a file format based on the popular ZIP file format and is used for aggregating many files into one. Although JAR can be used as a general archiving tool, the primary motivation for its development was so that Java applets and their requisi...
How do you determine the size of a file in C?
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Based on NilObject's code:
#include <sys/stat.h>
#include <sys/types.h>
off_t fsize(const char *filename) {
struct stat st;
if (stat(filename, &st) == 0)
return st.st_size;
return -1; ...
res.sendFile absolute path
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Based on the other answers, this is a simple example of how to accomplish the most common requirement:
const app = express()
app.use(express.static('public')) // relative path of client-side code
app.get('*', function(req, r...
What is the best way to test for an empty string with jquery-out-of-the-box?
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Based on David's answer I personally like to check the given object first if it is a string at all. Otherwise calling .trim() on a not existing object would throw an exception:
function isEmpty(value) {
return typeof value...
What is Ember RunLoop and how does it work?
...ons", "render", "afterRender", "destroy", "timers"]. Ember keeps their codebase pretty modular, and they make it possible for your code, as well as its own code in a separate part of the library, to insert more queues. In this case, the Ember Views library inserts render and afterRender queues, spec...