logical

T F

Numeric

Reals

a+b
a-b
a*b
a/b
a^b
exp
sqrt
a==b
a!=b
a<b
a<=b
a>b
a>=b

Complex

Complex 

Character

'a' 

Composed Objects

Vector

> vect<-c(1,2,3,5,7)
> mode(vect)
[1] "numeric"
> length(vect)
[1] 5

> names<-c("John","Ned","Sansa")
> starks<-c("Rob",names)
> starks
[1] "Rob"   "John"  "Ned"   "Sansa"
> mode(starks)
[1] "character"
> length(starks)
[1] 4

> x<-c(-5:5)
> x[1:3]
[1] -5 -4 -3
> x[2]<-0
> x
 [1] -5  0 -3 -2 -1  0  1  2  3  4  5

> x<-c(1:9)
> sqrt(x)
[1] 1.000000 1.414214 1.732051 2.000000 2.236068 2.449490 2.645751 2.828427
[9] 3.000000

Se pueden multiplicar, sumar, etc., vectores de la misma longitud, obte- niendo as ́ı un nuevo vector en donde se han multiplicado, sumando, etc., los elementos de cada uno de los vectores:

> x1<-c(0:3)
> x2<-c(1:4)
> x1+x2
[1] 1 3 5 7
> x1*x2
[1]  0  2  6 12
> x1-x2
[1] -1 -1 -1 -1
> x1/x2
[1] 0.0000000 0.5000000 0.6666667 0.7500000
> 

> z<-c(5,3,4)
> names(z)<-c("hipot","cat1","cat2")
> z
hipot  cat1  cat2 
    5     3     4 
> names(z)
> names(z)
[1] "hipot" "cat1"  "cat2" 

Matrix

> A<-matrix(c(1,2,3,4,5,6,7,8),ncol=4)
> A
     [,1] [,2] [,3] [,4]
[1,]    1    3    5    7
[2,]    2    4    6    8

> A<-matrix(c(1,2,3,4,5,6,7,8),nrow=4)
> A
     [,1] [,2]
[1,]    1    5
[2,]    2    6
[3,]    3    7
[4,]    4    8


> A<-matrix(c(1,2,3,4,5,6,7,8),nrow=2,ncol=2)
> A
     [,1] [,2]
[1,]    1    3
[2,]    2    4

> a
Error: object 'a' not found


B<-cbind(c(1:3),c(4:6))
> B
     [,1] [,2]
[1,]    1    4
[2,]    2    5
[3,]    3    6


> dim(B)
[1] 3 2

> t(B)
     [,1] [,2] [,3]
[1,]    1    2    3
[2,]    4    5    6


> C<- matrix(c(1,2,3,4,5,6,7,8), ncol=4, dimnames=list(c("Fila1","Fila2"),c("Col1","Col2","Col3","Col4")))
> C
      Col1 Col2 Col3 Col4
Fila1    1    3    5    7
Fila2    2    4    6    8

Factor

Values from limited categories.
Cara//Cruz.

data frame

Columns of different types, excel similar.

##list mixed types