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20150921
[Coursera]
R Programming
(6)
整理自
R Programming
(Week
1)
--
Vectorized Operations
[ Week 1 課程內容 ]
Introduction
(略過)
Overview and History of R
[16:07]
(完成)
Getting Help
[13:53]
(略過)
Console Input and Evaluation
[4:46]
(完成)
Data Types - R Objects and Attributes
[4:43]
(完成)
Data Types - Vectors and Lists
[6:27]
(完成)
Data Types - Matrices
[3:24]
(完成)
Data Types - Factors
[4:31]
(完成)
Data Types - Missing Values
[2:10]
(完成)
Data Types - Data Frames
[2:44]
(完成)
Data Types - Names Attribute
[1:49]
(完成)
Data Types - Summary
[0:43]
(完成)
Reading Tabular Data
[5:51]
(完成)
Reading Large Tables
[7:08]
(完成)
Textual Data Formats
[4:58]
(完成)
Connections: Interfaces to the Outside World
[4:35]
(完成)
Subsetting - Basics
(完成)
Subsetting - Lists
(完成)
Subsetting - Matrices
(完成)
Subsetting - Partial Matching
(完成)
Subsetting - Removing Missing Values
(完成)
Vectorized Operations
[3:46]
Introduction to swirl
(略過)
[ 本次筆記內容 ]
(一)Vectorized Operations
[ 補充資料 ]
http://www.programiz.com/
http://meliodaseren.blogspot.tw/
(一)
Vectorized Operations
[
參考資料
]
課堂簡報 :
https://d396qusza40orc.cloudfront.net/rprog/lecture_slides/Vectorized.pdf
[ 重點整理 ] R 語言的特性
運算的向量化
>> 運算變得簡單、容易,運算式也變得簡潔。
計算上可以並行
>> 提高程式執行效率。
1. 向量化運算
> x <- 1:4; y <- 6:9 # 建立"x","y"這兩個向量(x: 1~4, y: 6~9)
>
Please turn on JavaScript to use Paper in all of its awesomeness. ^_^
整理自 R Programming (Week 1) -- Vectorized Operations
Introduction(略過)Overview and History of R[16:07](完成)Getting Help[13:53] (略過)Console Input and Evaluation[4:46](完成)Data Types - R Objects and Attributes[4:43](完成)Data Types - Vectors and Lists[6:27](完成)Data Types - Matrices[3:24](完成)Data Types - Factors[4:31](完成)Data Types - Missing Values[2:10](完成)Data Types - Data Frames[2:44](完成)Data Types - Names Attribute[1:49](完成)Data Types - Summary[0:43](完成)Reading Tabular Data[5:51](完成)Reading Large Tables[7:08](完成)Textual Data Formats[4:58](完成)Connections: Interfaces to the Outside World[4:35](完成)Subsetting - Basics(完成)Subsetting - Lists(完成)Subsetting - Matrices(完成)Subsetting - Partial Matching(完成)Subsetting - Removing Missing Values(完成)Introduction to swirl(略過)(一)Vectorized Operations
> x <- 1:4; y <- 6:9 # 建立"x","y"這兩個向量(x: 1~4, y: 6~9)
>