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How can I create a UIColor from a hex string?
...NSScanner *scanner = [NSScanner scannerWithString:hexString];
[scanner setScanLocation:1]; // bypass '#' character
[scanner scanHexInt:&rgbValue];
return [UIColor colorWithRed:((rgbValue & 0xFF0000) >> 16)/255.0 green:((rgbValue & 0xFF00) >> 8)/255.0 blue:(rgbValu...
How to save a data.frame in R?
... Am I correct that write.table won't preserve things like having set up a column of 0's and 1's as a factor, but that save() / load() will? If so, that's something to take into account as well. I typically have a section of processing some .csv files and once I get them where I like them, ...
How can I write text on a HTML5 canvas element?
...
Yes of course you can write a text on canvas with ease, and you can set the font name, font size and font color.
There are two method to build a text on Canvas, i.e. fillText() and strokeText(). fillText() method is used to make a text that can only be filled with color, whereas strokeText()...
Is there a “do … while” loop in Ruby?
I'm using this code to let the user enter in names while the program stores them in an array until they enter an empty string (they must press enter after each name):
...
What's up with Java's “%n” in printf?
I'm reading Effective Java and it uses %n for the newline character everywhere. I have used \n rather successfully for newline in Java programs.
...
How to read from stdin line by line in Node
...es.txt');
//var readStream = process.stdin;
readStream.pause();
readStream.setEncoding('utf8');
var buffer=[];
readStream.on('data', (chunk) => {
const newlines=/[\r\n]+/;
var lines=chunk.split(newlines)
if(lines.length==1)
{
buffer.push(lines[0]);
return;
} ...
How do you implement a Stack and a Queue in JavaScript?
...the property. JavaScript also has a new operator, but that is just used to set this to a new empty object when calling a function. In C++ you need to pair every new with a delete, but not in JavaScript because GC. To stop using memory in JavaScript, just stop referencing the object and it will event...
Repeat Character N Times
In Perl I can repeat a character multiple times using the syntax:
23 Answers
23
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Use tab to indent in textarea
... var start = this.selectionStart;
var end = this.selectionEnd;
// set textarea value to: text before caret + tab + text after caret
$(this).val($(this).val().substring(0, start)
+ "\t"
+ $(this).val().substring(end));
// put caret at right position a...
Calculating moving average
I'm trying to use R to calculate the moving average over a series of values in a matrix. The normal R mailing list search hasn't been very helpful though. There doesn't seem to be a built-in function in R will allow me to calculate moving averages. Do any packages provide one? Or do I need to writ...