R Language Note 2

1. Data frame

Matrix form, but columns can be of different data types

Each column is a variable, and each row is an observation value

2. Draw Scatter chart

function plot ()

3. read text file data

(1) Set the working directory first, put the text file in the directory

Note: After you finish writing the data in Notepad, press ENTER to be responsible for errors in the R language

(2) Read clipboard

Text or Excel data can be manipulated through the clipboard

(3) Read Excel file data

Method 1: Read the PRN file format to save Excel as a space separator first

Method 2: Install the RODBC package, and then read through ODBC

4. Circular statements

For statement

While statement

5. R Script

Source () function

Print () function

　　

　　

　　

R Language Note 2