大约有 14,200 项符合查询结果（耗时：0.0295秒） [XML]
What's the absurd function in Data.Void useful for?
...s the following signature, where Void is the logically uninhabited type exported by that package:
6 Answers
...
What makes Lisp macros so special?
...of using Lisp macros. As someone who wants to understand the buzz, please explain what makes this feature so powerful.
14 A...
微软VS苹果 桌面操作系统的终极一战 - 创意 - 清泛网 - 专注C/C++及内核技术
...桌面操作系统的终极一战苹果将在九月份推出正式版的OS X El Capitan。虽然对于苹果来说，这看上去只是每年一次的例行升级，不过结合微软在7月底的大动作，今年的桌面操作系统大战，很有可能是这两家巨头厂商对于抢夺用户...
MIN and MAX in C
Where are MIN and MAX defined in C, if at all?
14 Answers
14
...
What is a race condition?
When writing multithreaded applications, one of the most common problems experienced is race conditions.
18 Answers
...
How to calculate a logistic sigmoid function in Python?
...
This should do it:
import math
def sigmoid(x):
return 1 / (1 + math.exp(-x))
And now you can test it by calling:
>>> sigmoid(0.458)
0.61253961344091512
Update: Note that the above was mainly intended as a straight one-to-one translation of the given ex...
What does the construct x = x || y mean?
I am debugging some JavaScript, and can't explain what this || does?
12 Answers
12
...
Cartesian product of x and y array points into single array of 2D points
I have two numpy arrays that define the x and y axes of a grid. For example:
13 Answers
...
Reference — What does this symbol mean in PHP?
...is is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.
...
Using Default Arguments in a Function
... declaration as follows so you can do what you want:
function foo($blah, $x = null, $y = null) {
if (null === $x) {
$x = "some value";
}
if (null === $y) {
$y = "some other value";
}
code here!
}
This way, you can make a call like foo('blah', null, 'non-defa...