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How do you detect where two line segments intersect? [closed]
...bering that s × r = − r × s):
u = (q − p) × r / (r × s)
Now there are four cases:
If r × s = 0 and (q − p) × r = 0, then the two lines are collinear.
In this case, express the endpoints of the second segment (q and q + s) in terms of the equation of the first li...
How do I get a file extension in PHP?
...uilt-in function to do that and not PHP (I am looking at Pythonistas right now :-)).
In fact, it does exist, but few people know it. Meet pathinfo():
$ext = pathinfo($filename, PATHINFO_EXTENSION);
This is fast and built-in. pathinfo() can give you other information, such as canonical path, depe...
Get nth character of a string in Swift programming language
... Note: This answer has been already edited, it is properly implemented and now works for substrings as well. Just make sure to use a valid range to avoid crashing when subscripting your StringProtocol type. For subscripting with a range that won't crash with out of range values you can use this impl...
Determine what attributes were changed in Rails after_save callback?
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I think after_update is deprecated now? Anyway, I tried this in an after_save hook and that seemed to work fine. (The changes() hash still hasn't been reset yet in an after_save, apparently.)
– Tyler Rick
Mar 14 '13 at 5:...
How do I share IntelliJ Run/Debug configurations between projects?
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This rules, its exactly what I wanted to know, because indeed we were ignoring .idea and there was no way to unignore it without big headaches.
– David Mann
Jan 29 '19 at 21:56
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Adding an arbitrary line to a matplotlib plot in ipython notebook
.... What about diagonal lines? I edited the question to add the diagonal bit now that you've shown me the h & v lines.
– JD Long
Oct 12 '12 at 17:51
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Are std::vector elements guaranteed to be contiguous?
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Now I know why my program was segfaulting yesterday, when I looped through it in a double loop removing certain elements :) Thanks!
– user2891462
Jul 30 '15 at 15:29
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Re-raise exception with a different type and message, preserving existing information
...ture, the __cause__ attribute is set. The built-in exception handler also knows how to report the exception's “cause” and “context” along with the traceback.
In Python 2, it appears this use case has no good answer (as described by Ian Bicking and Ned Batchelder). Bummer.
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Trying to mock datetime.date.today(), but not working
...f today(cls):
return cls(2010, 1, 1)
datetime.date = NewDate
And now you could do:
>>> datetime.date.today()
NewDate(2010, 1, 1)
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How to convert Milliseconds to “X mins, x seconds” in Java?
...stead of subtracting the minutes, it looks cleaner. However, one needs to know that 1 min = 60 sec to do that... =)
– Per Alexandersson
Feb 12 '12 at 21:15
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