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快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...样一件事，不断的开仓、平仓、再开仓、再平仓。。。
2、何谓：对冲？在做空制度下，同时，持有空单和多单，以此将市场暴涨暴跌对账户的冲击降低到可接受范围；
3、何谓：套利？在狭义上，分跨期套利、跨品种套利，目...
Looping over a list in Python
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200
Try this,
x in mylist is better and more readable than x in mylist[:] and your len(x) should ...
What are the most common non-BMP Unicode characters in actual use? [closed]
... the most common non-BMP characters by far. ????, otherwise known as U+1F602 FACE WITH TEARS OF JOY, is the most common one on Twitter's public stream. It occurs more frequently than the tilde!
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C++ stl stack/queue 的使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...义stack 对象的示例代码如下：
stack<int> s1;
stack<string> s2;
stack 的基本操作有：
入栈，如例：s.push(x);
出栈，如例：s.pop(); 注意，出栈操作只是删除栈顶元素，并不返回该元素，使用top()访问元素。
访问栈顶，如例：s.top()
判...
What is a database transaction?
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248
A transaction is a unit of work that you want to treat as "a whole." It has to either happen i...
Compare floats in php
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237
If you do it like this they should be the same. But note that a characteristic of floating-poi...
Leading zeros for Int in Swift
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Assuming you want a field length of 2 with leading zeros you'd do this:
import Foundation
for myInt in 1 ... 3 {
print(String(format: "%02d", myInt))
}
output:
01
02
03
This requires import Foundation so technically it is not a part of the Swift la...
How do I make an HTTP request in Swift?
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20 Answers
20
Active
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promise already under evaluation: recursive default argument reference or earlier problems?
...occur we get:
f <- function(x, T) {
10 * sin(0.3 * x) * sin(1.3 * x^2) + 0.001 * x^3 + 0.2 * x + 80
}
g <- function(x, T, f. = f) { ## 1. note f.
exp(-f.(x)/T)
}
test<- function(g. = g, T = 1) { ## 2. note g.
g.(1,T)
}
test()
## [1] 8.560335e-37
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Python super() raises TypeError
In Python 2.5, the following code raises a TypeError :
4 Answers
4
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