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Better explanation of when to use Imports/Depends
...library() is needed, and R won't notify you at the console at package load-time unless the Imported package cannot be found.
– Josh O'Brien
Dec 26 '11 at 20:32
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How can I deploy an iPhone application from Xcode to a real iPhone device?
...is does have some problems, though--you can only install up to 3 apps at a time, and you need to renew the certificate every week.
– SilverWolf - Reinstate Monica
Feb 6 '18 at 23:10
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How to change the cursor into a hand when a user hovers over a list item?
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In light of the passage of time, as people have mentioned, you can now safely just use:
li { cursor: pointer; }
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MySQL high CPU usage [closed]
... MySQL Slow Query Log to keep an eye on any queries that are taking a long time, and use that to make sure you don't have any queries locking up key tables for too long.
Some other things you can check would be to run the following query while the CPU load is high:
SHOW PROCESSLIST;
This will sh...
Obtaining a powerset of a set in Java
...ts in the power set, but each set has to be created in memory, which takes time proportional to the set size at least. According to wolfram alpha, it's in O(n * 2^n): wolfram alpha query
– fabian
May 24 '15 at 13:53
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How does SIGINT relate to the other termination signals such as SIGTERM, SIGQUIT and SIGKILL?
...ith no
readers
SIGALRM 14 Term Timer signal from alarm(2)
SIGTERM 15 Term Termination signal
SIGUSR1 30,10,16 Term User-defined signal 1
SIGUSR2 31,12,17 Term User-defined signal 2
SIGCHLD 20,17,18 Ign Child stopped o...
Hashset vs Treeset
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HashSet is much faster than TreeSet (constant-time versus log-time for most operations like add, remove and contains) but offers no ordering guarantees like TreeSet.
HashSet
the class offers constant time performance for the basic operations (add, remove, contains and...
How is the undo tree used in Vim?
...e.
There are two ways to traverse the undo tree. One is to go "back in time". g+ and g- will traverse all of the nodes in the tree in chronological or reverse-chronological order (which can be a bit confusing, because it can jump arbitrarily between undo branches, but if you do g- long enough y...
How do I iterate over the words of a string?
...more than double as fast as the fastest tokenize on this page and almost 5 times faster than some others. Also with the perfect parameter types you can eliminate all string and list copies for additional speed increases.
Additionally it does not do the (extremely inefficient) return of result, but ...
Why do x86-64 systems have only a 48 bit virtual address space?
...t's a lot. You're not going to see a system which needs more than that any time soon.
So CPU manufacturers took a shortcut. They use an instruction set which allows a full 64-bit address space, but current CPUs just only use the lower 48 bits. The alternative was wasting transistors on handling a b...