2016年6月9日 · The relation you are alluding to with the asymmetric sign function is $\operatorname{sgn}^+x=2H(x)-1$. $\endgroup$ – Mario Carneiro Commented Jun 9, 2016 at …

知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业 …

Let $X$ be a real valued random variable. Let $\operatorname{sgn}(x)$ be $1$ when $x>0$, $-1$ when $x<0$ and $0$ when $x=0$.

2.x = abs(x)×sgn(x)或者abs(x) = (x)×sgn(x) 3.定义域为（ - ∞， + ∞），值域为 { - 1，0, 1}. 4.sgn是英文sign(标记)的缩写。 [2] 返回函数. 表返回表示数字符号的整数。 Sgn(number) …

2019年10月20日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for …

Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their …

Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their …

Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their …

2017年9月17日 · Considering derivative of discontinuity as del(x). Derivative of sgn(x) would be 2*del(x), as there exist a discontinuity at x=0 and a change in step by 2 units (from -1 to +1). …

2022年12月9日 · Here's one way to compute it. We have for $\phi \in C^{\infty}_0$ $$\left<\frac{\partial}{\partial y}\text{sgn}(x-y),\phi\right> = -\left<\text{sgn}(x-y),\frac ...