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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
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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
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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
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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...
How do I create test and train samples from one dataframe with pandas?
...y distributed random numbers between 0 and 1.
– R. Max
Jun 10 '14 at 18:43
5
Can someone explain ...
Get the first item from an iterable that matches a condition
...lting method not process the entire list, which could be quite large. For example, the following function is adequate:
13 A...