合约在solidity中的合约可以类比看做java等面向对象语言中的类。合约可以包含状态变量、函数、函数修饰符、事件、错误、结构体、枚举类型等等。还有一些特殊的合约可以被称作库或者接口状态变量状态变量指的是永久存...

编辑主题的 source/css/_variables/custom.styl 文件，新增变量：

Object oriented classes work much like classes in other languages. Learn how to create them and use them, learn the difference between class variables and insta...

-be able to explain why identifying correlations is useful for data wrangling/analysis

上一篇ZZ介绍了本篇综述的摘要和引言，了解到了本篇文章主要是关于基于“潜在结果框架”的因果推断方法综述。下面我们继续解析论文，探索作者给我们描绘的因果世界，首先附一下上篇内容：...

从错误即可知道是时区的错误，因此只要将时区设置为你当前系统时区即可，因此使用root用户登录mysql，按照如下图所示操作即可。show variables like '%time_zone%';...

auto is the weakest concept. Concept names convey more meaning than just auto.

Prevent surprises from unexpectedly changed object values.

“Linear Regression with multiple variables——Normal equation and non-invertibility”

“Linear Regression with multiple variables——Normal equation”