I’d like to separate the first column into two with separator being a dot.
Here is the data frame:

`V1  V2
1 01.01 1.5
2 01.02 2.3
3 01.03   4
4 01.04 1.7`

Here is my code:

separate(df4, col = 1, into = c("x","y"), sep = ".")

Here is the warning message:

Expected 2 pieces. Additional pieces discarded in 4 rows [1, 2, 3, 4]. 

Here is my code:

separate(df4, col = 1, into = c("x","y"), sep = ".")

And the resulting table looks as follows:

x y  V2
    1.5
    2.3
    4
    1.7

The warning message: Expected 2 pieces. Additional pieces discarded in 4 rows [1, 2, 3, 4].