大约有 40,000 项符合查询结果(耗时:0.0463秒) [XML]

https://stackoverflow.com/ques... 

What is the difference between Θ(n) and O(n)?

...e of the algorithm as n gets larger is at most proportional to g(n). Normally, even when people talk about O(g(n)) they actually mean Θ(g(n)) but technically, there is a difference. More technically: O(n) represents upper bound. Θ(n) means tight bound. Ω(n) represents lower bound. ...
https://stackoverflow.com/ques... 

How do you round a floating point number in Perl?

.... For rounding to a certain number of digits, sprintf() or printf() is usually the easiest route. printf("%.3f", 3.1415926535); # prints 3.142 The POSIX module (part of the standard Perl distribution) implements ceil(), floor(), and a number of other mathematical and trigonometric func...
https://stackoverflow.com/ques... 

Equals(=) vs. LIKE

...tify an example where these operators produce obviously different results. Allow me to quote from the MySQL manual: Per the SQL standard, LIKE performs matching on a per-character basis, thus it can produce results different from the = comparison operator: mysql> SELECT 'ä' LIKE 'ae' COLLA...
https://stackoverflow.com/ques... 

What are the advantages of NumPy over regular Python lists?

... Python objects, at least 4 bytes per pointer plus 16 bytes for even the smallest Python object (4 for type pointer, 4 for reference count, 4 for value -- and the memory allocators rounds up to 16). A NumPy array is an array of uniform values -- single-precision numbers takes 4 bytes each, double-pr...
https://stackoverflow.com/ques... 

How do I localize the jQuery UI Datepicker?

I really need a localized dropdown calendar. An English calendar doesn't exactly communicate excellence on a Norwegian website ;-) ...
https://stackoverflow.com/ques... 

C library function to perform sort

... qsort() is the function you're looking for. You call it with a pointer to your array of data, the number of elements in that array, the size of each element and a comparison function. It does its magic and your array is sorted in-place. An example follows: #include <st...
https://stackoverflow.com/ques... 

Catch-22 prevents streamed TCP WCF service securable by WIF; ruining my Christmas, mental health

...WCF net.tcp service endpoint using WIF . It should authenticate incoming calls against our token server. The service is streamed because it is designed to transfer large amounts of data n stuff. ...
https://stackoverflow.com/ques... 

How to fix a locale setting warning from Perl?

...cale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). My guess is you used ssh to connect to this older host from a newer desktop ma...
https://stackoverflow.com/ques... 

A better similarity ranking algorithm for variable length strings

...yields better results on variable length strings than the ones that are usually suggested (levenshtein distance, soundex, etc). ...
https://stackoverflow.com/ques... 

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock'

I installed MySQL on Mac OS X Mountain Lion with homebrew install mysql , but when I tried mysql -u root I got the following error: ...