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How do I calculate the normal vector of a line segment?
...x', y') = (y, -x) seems to be right, but why would one use dx and dy here. Moreover, based on slopes, m1 * m2 = -1 for right angle lines, hence dy' = dx' * (-dx/dy) and dx' = dy' * (-dy/dx), how come in your equation normal.x = x' = -dy?
– legends2k
Jan 25 '13 ...
Lisp in the real world
... found it to be a very beautiful language that I am interested in learning more about. However, it appears that Lisp is never used in serious projects, and I haven't seen it listed as a desired skill on any job posting. I am interested in hearing from anyone who has used Lisp or seen it used in th...
Using Mockito to mock classes with generic parameters
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JavaScript/jQuery to download file via POST with JSON data
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Xcode stuck on Indexing
...ason because Xcode got stucked on "Indexing". I can't Build the project anymore. If I try to build, Xcode freezes and I have to force quit. This happens only with this project.
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How to generate and validate a software license key?
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edited to be more obvious; cannot over-emphasize something that fundamental ;-)
– Steven A. Lowe
Dec 10 '10 at 15:09
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Why is MySQL's default collation latin1_swedish_ci?
...g latin1_swedish_ci as the compiled default when other options seem much more reasonable, like latin1_general_ci or utf8_general_ci ?
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initialize a numpy array
...es are set-up. Numpy arrays are made to be fast by virtue of being able to more compactly store values, but they need to be have fixed size to obtain this speed. Python lists are designed to be more flexible at the cost of speed and size.
– Justin Peel
Dec 26 '...
Threading in a PyQt application: Use Qt threads or Python threads?
...ered non-blocking I/O using Twisted or non-blocking sockets/select?
EDIT: more on threads
Python threads
Python's threads are system threads. However, Python uses a global interpreter lock (GIL) to ensure that the interpreter is only ever executing a certain size block of byte-code instructions a...