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) |