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Cartesian product of x and y array points into single array of 2D points
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[2, 5],
[3, 5]])
See Using numpy to build an array of all combinations of two arrays for a general solution for computing the Cartesian product of N arrays.
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C dynamically growing array
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@Balkania: 7 * 3264 * 32 bit sounds like 91.39 kilobytes. Not that much by any standard these days ;)
– Wolph
Aug 21 '10 at 3:57
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JavaScript + Unicode regexes
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Situation for ES 6
The upcoming ECMAScript language specification, edition 6, includes Unicode-aware regular expressions. Support must be enabled with the u modifier on the regex. See Unicode-aware regular expressions in ES6.
Until ES 6 is finished a...
What's the difference between passing by reference vs. passing by value?
...e": any operation on them that seems to alter the value actually creates a completely new object without affecting the original one. So, passing an object of such a type as an argument always has the effect of pass-by-value: a copy for the callee will be made automatically if and when it needs a cha...
What is a “cache-friendly” code?
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Optimizing cache usage largely comes down to two factors.
Locality of Reference
The first facto...
Why does Java switch on contiguous ints appear to run faster with added cases?
...tecode instruction tableswitch).
However, once the JIT starts its job and compiles the bytecode into assembly, the tableswitch instruction does not always result in an array of pointers: sometimes the switch table is transformed into what looks like a lookupswitch (similar to an if/else if structur...
Controlling fps with requestAnimationFrame?
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Hydroper
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answered Nov 4 '13 at 16:25
markEmarkE
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Usage of __slots__?
...ot descriptor has a slot separate from the Wrong's. This shouldn't usually come up, but it could:
>>> w = Wrong()
>>> w.foo = 'foo'
>>> Base.foo.__get__(w)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: foo
>>>...
Append an object to a list in R in amortized constant time, O(1)?
...ctors too, so do I get the bonus points?
Edit (2015-Feb-01): This post is coming up on its fifth birthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(oldlist, list(someobj))
In...
When to use volatile with multi threading?
...variable then many tutorials say make the variable volatile to prevent the compiler caching the variable in a register and it thus not getting updated correctly.
However two threads both accessing a shared variable is something which calls for protection via a mutex isn't it?
But in that case, betw...