大约有 47,000 项符合查询结果（耗时：0.0527秒） [XML]
Why is === faster than == in PHP?
...|
edited Nov 11 '19 at 5:58
Lucas
36411 gold badge66 silver badges1212 bronze badges
answered Mar 8 '10 ...
Best way to find the intersection of multiple sets?
...
edited Dec 11 '19 at 13:08
Jean-François Fabre♦
122k1111 gold badges9797 silver badges156156 bronze badges
...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
... range:
1-127 are user defined codes (so generated by calling exit(n))
128-255 are codes generated by termination due to different unix signals like SIGSEGV or SIGTERM
But I don't think you should care while coding on Java, it's just a bit of information. It's useful if you plan to make your pro...
numpy matrix vector multiplication [duplicate]
...>> b = np.array([1, 2, 3])
>>> print a.dot(b)
array([16, 6, 8])
This occurs because numpy arrays are not matrices, and the standard operations *, +, -, / work element-wise on arrays. Instead, you could try using numpy.matrix, and * will be treated like matrix multiplication.
Ot...
How to get the class of the clicked element?
...
answered Jun 8 '09 at 10:07
FentonFenton
193k5555 gold badges338338 silver badges356356 bronze badges
...
Detect IE version (prior to v9) in JavaScript
...
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]> <html class="lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]> <html class="lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html...
PhpStorm wrap/surround selection?
...e Surround With options dialog box will be displayed.
Update (for PhpStorm8)
For PhpStorm Version 8, tick on checkbox of Preferences -> Editor -> General -> Smart Keys -> Surround selection on typing quote or brace.
Update (for PhpStorm 2016)
For PhpStorm Version 2016, use Cmd + Alt ...
binning data in python with scipy/numpy
...
184
It's probably faster and easier to use numpy.digitize():
import numpy
data = numpy.random.rand...
How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?
...
answered Apr 8 '10 at 19:08
Grzegorz OledzkiGrzegorz Oledzki
20k1414 gold badges6060 silver badges9393 bronze badges
...
Can I make the foreign key field optional in Django model
...:55
akki
8721414 silver badges2626 bronze badges
answered Jul 8 '11 at 4:58
Abid AAbid A
...