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How does a language expand itself? [closed]
...MA controller via the I/O address space (not the memory space) on a PC, at least if you're sane. Modern x86 CPUs like to reorder memory accesses to improve performance. With MMIO, that can be disastrous...so you'd need to be careful to make those addresses uncacheabke and put serializing instructio...
Why are quaternions used for rotations?
...se representations of rotations are used in practice. Euler angles use the least memory; matrices use more memory but don't suffer from Gimbal lock and have nice analytical properties; and quaternions strike a nice balance of both, being lightweight, but free from Gimbal lock.
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Too many 'if' statements?
...able in the long term I'd use an approach involving enumerated types or at least named constants.
– JAB
Mar 19 '14 at 15:11
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Is it correct to use JavaScript Array.sort() method for shuffling?
...ble. If c ~ n log n then 2^c ~ n^(a·n) where a = const, which makes it at least possible that 2^c is of same magnitude as (or even less than) n! and thus leading to an uneven distribution, even if the sorting algorithm where to map onto the permutaions evenly. If this has any practical impact is be...
When should one use HTML entities?
...5;
The UTF-8 and HTML entity encodings are both meaningless to me, but at least the UTF-8 encoding is recognizable as a foreign language, and it will render properly in an edit box. The article goes on to say the following about the HTML entity-encoded version:
Extremely inconvenient for those ...
Does JavaScript have “Short-circuit” evaluation?
... of the && operator.
How it really works:
By now, we should at least have a picture how the short-circuit operators work. The universal rule goes:
(some falsy expression) && expr will evaluate to falsy expression
(some truthy expression) || expr will evaluate to truthy expressi...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
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At least five answers for one generic question.
Depending on
posix compliant: could work on poor systems with generic shell environments
bash specific: using so called bashisms
and if you want
simple ``in line'' question ...
What is the difference between bottom-up and top-down?
...ide which subproblems to reveal.)
Memoization, Tabulation
There are at least two main techniques of dynamic programming which are not mutually exclusive:
Memoization - This is a laissez-faire approach: You assume that you have already computed all subproblems and that you have no idea what the...
What are the minimum margins most printers can handle?
...hem do it on their computer. Print dialogs usually (Adobe and Preview, at least) give you an option to scale and center the output on the printable area of the page:
Adobe
Preview
Of course, this assumes that you have computer literate users, which may or may not be the case.
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Why is there a difference in checking null against a value in VB.NET and C#?
...t the number of different definitions of equality that may be useful in at least some circumstances exceeds the number of commonly-available means to express them. This problem is in some cases made worse by an unfortunate belief that it is confusing to have different means of testing equality yield...