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Rotating a point about another point (2D)
... pivot point to the new coordinates (x' + a, y' + b).
Following the above description:
a 2D clockwise theta degrees rotation of point (x, y) around point (a, b) is:
Using your function prototype: (x, y) -> (p.x, p.y); (a, b) -> (cx, cy); theta -> angle:
POINT rotate_point(float cx, floa...
Regex to get string between curly braces
... based on the language you work in. Javascript takes the index to stop at, PHP takes the length of the desired end result (unless it's negative, in which case it takes the number of characters to remove), C# is different again...nice and confusing.
– jvenema
Ja...
Can I create more than one repository for github pages?
...you can change the publishing source in the repository settings.
A better description is available in the GitHub Pages documentation, including options for using custom domain names.
(since April 2013, all username.github.com are now username.github.io)
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Cost of len() function
...the length is small (O(1) in big-O notation) and mostly consists of [rough description, written in Python terms, not C terms]: look up "len" in a dictionary and dispatch it to the built_in len function which will look up the object's __len__ method and call that ... all it has to do is return self.l...
Is there any way to delete local commits in Mercurial?
...red Feb 26 '10 at 2:02
too much phptoo much php
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How can I find the location of origin/master in git, and how do I change it?
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Note that this description is incomplete. I currently am experiencing # On branch master # Your branch is ahead of 'origin/master' by 3 commits. But git diff origin/master shows nothing, (and the --cached option does not change this). ...
What is the fastest way to get the value of π?
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Here's a general description of a technique for calculating pi that I learnt in high school.
I only share this because I think it is simple enough that anyone can remember it, indefinitely, plus it teaches you the concept of "Monte-Carlo" me...
Determine if variable is defined in Python [duplicate]
...eleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby.
6 Answers
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Check if an array is empty or exists
...iable hoisting. Make sure you use var whenever declaring a variable:
<?php echo "var image_array = ".json_encode($images);?>
// add var ^^^ here
And then make sure you never accidently redeclare that variable later:
else {
...
image_array = []; // no var here
}
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When would I use XML instead of SQL? [closed]
...used, which is storing all of my data in a (My)SQL database and then using PHP/Python/etc. to work with it on the web as needed.
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