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标准差和方差 May 30th, 2020

标准差

标准差是数值分散的测量。

标准差的符号是 σ (希腊语字母 西格马,英语 sigma)

公式很简单:方差平方根。那么…… “方差是什么?”

方差

方差的定义是:

离平均的平方距离的平均。

按照以下的步骤来计算方差:

例子

你和朋友们量度了狗狗的身高(毫米):
狗图肩高

身高(到肩膀)是:600mm、470mm、170mm、430mm 和 300mm。

求平均、方差和标准差。

第一步是求平均:

答案:

平均  =  600 + 470

Posted in DATABASE || Comments Off on 标准差和方差
Sniptool – Screen Capture May 26th, 2020

Sniptool – Screen Capture

Posted in Web Design || Comments Off on Sniptool – Screen Capture
Python for Machine Learning: Indexing and Slicing for Lists, Tuples, Strings, and other Sequential Types May 25th, 2020

List is arguably the most useful and ubiquitous type in Python. One of the reasons it’s so handy is Python slice notation. In short, slicing is a flexible tool to build new lists out of an existing list.

Python supports …

Posted in Python || Comments Off on Python for Machine Learning: Indexing and Slicing for Lists, Tuples, Strings, and other Sequential Types
flask-mdict 架设自己的 MDict Web Server May 23rd, 2020


https://github.com/liuyug/flask-mdict!
针对非 IT 人员,多说些:

1. 安装 python3,加入到 windows 路径
2. 下载  https://github.com/liuyug/flask-mdict/archive/master.zip 并解压缩
3. 打开 cmd 窗口,进入解压缩目录
4. 安装依赖包,pip3 install -r requirements.txt
5.建立 content 目录, mkdir content8 I. I; a3 d* r
6. 下载词频信息  https://github.com/skywind3000/ECDICT/raw/master/ecdict.csv
7.将 ecdict.csv 转换为 sqlite3
Posted in Dictionary || Comments Off on flask-mdict 架设自己的 MDict Web Server
Microsoft IME + Japanese Useful ShortCut May 23rd, 2020
  • Press Alt + Shift to change the input language
  • Press Ctrl + Caps Lock to change to Hiragana
  • Press Alt + Caps Lock to change to Katakana
  • Press Alt + ~ to toggle between alphanumeric and kana modes
Posted in 中英日 || Comments Off on Microsoft IME + Japanese Useful ShortCut