test for data type

is.numeric(), is.character(), is.vector(), is.matrix(), is.data.frame()

convert it
as.numeric(), as.character(), as.vector(), as.matrix(), as.data.frame)

 

vector/matrix/data.frame

 

to one long
vector

to
matrix

to
data frame

from
vector

c(x,y)

cbind(x,y)

rbind(x,y)

data.frame(x,y)

from
matrix

as.vector(mymatrix)

 

as.data.frame(mymatrix)

from
data frame

 

as.matrix(myframe)