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What is R or Rstudio?

1. programming language
2. environment that is used for computing,statistics and drawing

Preparations

set the size of words:

mac: 'command -' is lessen£¬and of course 'command+' is becoming larger

Basic managements

1. one Rproject only interacts with on directory, so be care with what may annoys u in the future
2. display dir/files lists

dir()

list.files()

1. +-*/
2. assignments

a<- 111

1. deletion

rm(a)
rm(b,c) 
rm(list = ls())

1. history

history()

click a sentence twice, it will appear behind of '>'

1. drawing plots and boxplots

plot(runif(50))

boxplot(iris$Sepal.Length~iris$Species,col = c("lightblue","lightyellow","lightpink"))