大约有 47,000 项符合查询结果（耗时：0.1009秒） [XML]
What are bitwise operators?
I'm someone who writes code just for fun and haven't really delved into it in either an academic or professional setting, so stuff like these bitwise operators really escapes me.
...
Query a parameter (postgresql.conf setting) like “max_connections”
.... The manual:
This parameter can only be set at server start.
To see all settings:
SHOW ALL;
There is also pg_settings:
The view pg_settings provides access to run-time parameters of the
server. It is essentially an alternative interface to the SHOW and
SET commands. It also provide...
Find the most frequent number in a numpy vector
...
If your list contains all non-negative ints, you should take a look at numpy.bincounts:
http://docs.scipy.org/doc/numpy/reference/generated/numpy.bincount.html
and then probably use np.argmax:
a = np.array([1,2,3,1,2,1,1,1,3,2,2,1])
counts = np.bi...
Are “elseif” and “else if” completely synonymous?
...tom line is that both would result in exactly the same behavior.
Essentially, they will behave the same, but else if is technically equivalent to a nested structure like so:
if (first_condition)
{
}
else
{
if (second_condition)
{
}
}
The manual also notes:
Note that elseif and els...
How to set the width of a cell in a UITableView in grouped style
...her two are worse.
Adjust table view width in -viewWillAppear:
First of all, this is unreliable, the superview or parent view controller may adjust table view frame further after -viewWillAppear: is called. Of course, you can subclass and override -setFrame: for your UITableView just like what I ...
How does JavaFX compare to WPF? [closed]
...eeks. Here is a high level overview of how it compares to WPF in my eyes:
All of my comments are related to JavaFX 2.0. This information will probably be subject to change as the platform is still fairly immature and is being actively developed.
Graphics
Like WPF, JavaFX uses a retained graphics ...
Is there a vr (vertical rule) in html?
... rule.
It does not make logical sense to have one. HTML is parsed sequentially, meaning you lay out your HTML code from top to bottom, left to right how you want it to appear from top to bottom, left to right (generally)
A vr tag does not follow that paradigm.
This is easy to do using CSS, howeve...
Does have to be in the of an HTML document?
...displayed, making them shift on size/shape/font and/or flicker. It is generally a sign of bad craftsmanship. Generally you can get away with putting style anywhere you want, but try to avoid it whenever it is possible.
HTML 5 introduced a scoped attribute that allowed style tags to be included ever...
git:// protocol blocked by company, how can I get around that?
...
If this is an issue with your firewall blocking the git: protocol port (9418), then you should make a more persistent change so you don't have to remember to issue commands suggested by other posts for every git repo.
The below solution also just works for su...
jQuery If DIV Doesn't Have Class “x”
...
@zuk1: Well, from your snippet, you take all elements with class 'thumb' and do a hover() on each one. Are you saying you want to just do hover on one element? WHat is that one element? I am confused.
– alphadogg
Feb 6 '09 at 1...