大约有 47,000 项符合查询结果（耗时：0.0432秒） [XML]
WHERE vs HAVING
...ain any aggregates, putting it into the WHERE clause will most probably be more efficient.
share
|
improve this answer
|
follow
|
...
How to determine the content size of a UIWebView?
...
|
show 15 more comments
92
...
Remove all but numbers from NSString
...tring separator. Not as efficient as picking through characters, but much more compact in code.
share
|
improve this answer
|
follow
|
...
How to find unused images in an Xcode project?
...
|
show 3 more comments
80
...
How do you clear a stringstream variable?
..."");
is correct, although using:
m.str(std::string());
is technically more efficient, because you avoid invoking the std::string constructor that takes const char*. But any compiler these days should be able to generate the same code in both cases - so I would just go with whatever is more read...
Rolling median algorithm in C
...all \eqn{k} or \eqn{n}.}
}
}
It would be nice to see this re-used in a more standalone fashion. Are you volunteering? I can help with some of the R bits.
Edit 1: Besides the link to the older version of Trunmed.c above, here are current SVN copies of
Srunmed.c (for the Stuetzle version)
Trun...
Convert floating point number to a certain precision, and then copy to string
...r Python versions above 3 (e.g. 3.2 or 3.3), option two is preferred.
For more information on option two, I suggest this link on string formatting from the Python documentation.
And for more information on option one, this link will suffice and has info on the various flags.
Python 3.6 (officiall...
Finding the index of elements based on a condition using python list comprehension
...t; 2)
[2, 5]
Note that I'm using lists here to mimic Matlab. It would be more Pythonic to use generators and iterators.
share
|
improve this answer
|
follow
...
Converting Epoch time into the datetime
...
see docs.python.org/2/library/time.html#time.strftime for more info in the format string
– georg
Jul 27 '13 at 21:01
|
show...