I've been studied 01 Package for so many times. But I keep forgetting it. It costs me so many energy every time I learn, especially for the optimization of space complexity. So I take notes this time.
This is a very simple version of SQL grammar. For the sake of time, I just write some very basic usage.
数据库项目目前实现了一个简单的词法分析器,其中就是读取SQL语句中的字符,把他们转换成相应的Token。
Basemap
is a plug-in of matplotlib
. Matplotlib
is a drawing library that helps to draw data in multiple ways using python. And Basemap
is used to draw maps. The followings are steps to install basemap
.
第四章 随机变量的数字特征
离散型
$$
E(X)=\sum_{k=1}^{\infty} x_{k} p_{k}
$$
当上式发散时,$X$的数学期望不存在。
Recently, while trying to accelerate my blog load speed, I also want to get all my pictures a cdn. Also I’m tired of uploading the picture every time I want to quote a picture in my post, So I found a softeware PicGo.
最近开课计算机组成原理,由于疫情原因,老师推荐的华中科技大学的秦磊华老师讲的MOOC上的课程。感觉学习难度比较大,因为基础薄弱,所以来总结一下学习的知识,加以巩固。