Question

I am trying to convert numeric format to an integer in R. This is essential to a part of the project where I am using java code to run some simulations (which reads this particular data as int).

I tried both round(x$var, 0) and trunc(x$var). Both of them run successfully, but when I str(x), x$var is still num. x is a dataframe.

Answer 1

Use as.integer:

set.seed(1)
x <- runif(5, 0, 100)
x
[1] 26.55087 37.21239 57.28534 90.82078 20.16819


as.integer(x)
[1] 26 37 57 90 20

Test for class:

xx <- as.integer(x)
str(xx)
 int [1:5] 26 37 57 90 20