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How do I calculate the normal vector of a line segment?
...(x', y') = (-y, x) and (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
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How to see which plugins are making Vim slow?
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Just in case anyone else is wondering, this doesn't exist in all vim/gvim distros. Doesn't in a stock Win Gvim 7.4 over here (though it is documented in viminfo)
– thynctank
Aug 26 '14 at 16:28
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Why are joins bad when considering scalability?
...don't need to in volume, and the things you actually do you make sure are done as efficiently as possible.
In that context, of course joining two separate data sources is relatively slow, at least compared to not joining them, because it's work you need to do live at the point where the user request...
Is there a link to the “latest” jQuery library on Google APIs? [duplicate]
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Linking to the google API one is likely to increase your website speed due to the fact that there is a high chance your user already has it cached from another website, and therefore will not need to download it again from you. Hosting it yourself jus...
How do I find the current executable filename? [duplicate]
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This one tends to add ".vhost." in the filename, an issue not present if using System.Reflection.Assembly.GetEntryAssembly().Location (see alternate answer).
– Contango
Aug 2 '12 at 15:59
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How to check if an object is an array?
...ing. If it's a string, then I want to convert it to an array with just the one item so I can loop over it without fear of an error.
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Difference between a “coroutine” and a “thread”?
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Coroutines are a form of sequential processing: only one is executing at any given time (just like subroutines AKA procedures AKA functions -- they just pass the baton among each other more fluidly).
Threads are (at least conceptually) a form of concurrent processing: multip...
Passing functions with arguments to another function in Python?
... What about named parameters? That is, def action1(arg1, arg2=None, arg3=None), how could you pass an argument that you intend to be assigned to arg3, for instance?
– ChaimKut
Aug 19 '14 at 9:54
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Query for documents where array size is greater than 1
...javascript in the query, json can be cumbersome. Many of these queries are one time only entered by hand so optimization is not required. I'll use this trick often +1
– pferrel
Mar 20 '14 at 15:37
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Good examples of Not a Functor/Functor/Applicative/Monad?
While explaining to someone what a type class X is I struggle to find good examples of data structures which are exactly X.
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