Factor

We now see that the class is a factor, as we can see in the following output:

[1] "factor"

Now, we can also look at the internal structure of this vector x, using str() as follows:

str(x)

We now see that it converts 1, 2, and 3 to factors:

[1]  Factor w/ 3 levels "1", "2", "3": 1 2 3