R language-data types and operators

I. Online installation package

Install.packages (Package_name)

Two. View variables

LS ()

Three. Deleting variables

RM ()

Four. Variable type

Meta data types: characters, shaping, numbers, imaginary, BOOL

Vector: Vec=c (a)

List: ls=list (1, ' A ', C ()

Matrix: Matri=matrix (C (1,2,2,2,3,4), nrow=2,ncol=3,byrow=ture)

Data frames: Frame=data.frame (name=c ("Zhangsan", "Wangwu", "Lisi"), Age=c (12,13,23), Gender=c ("M", "F", "M"))

Array: Arr=array (C (VEC1,VEC2), dim=c (number of rows, number of columns, dimensions)//each vector is arranged in columns

Factor: Vec=c (1,2,3,4)

Fac=factor (VEC)

Five, several important operators:

Percent: to find the remainder

%/%: Seeking integer quotient

%in%: Judging whether the former is in the latter

%*%: Multiplication of matrices with their inverse matrices

&& | | : Compare the first value of a vector

R language-data types and operators