# Creating an empty dataframe
result_df <- data.frame()

# Iterating over the numbers 1 to 3
for (i in 1:3) {
  # Create a new column and populate it with values of i
  result_df[, paste0("Column", i)] <- i
}

I expect to have the following populated dataframe:

  Column1 Column2 Column3
1       1       2       3

>Solution :

R is vectorized and this can be done without loops at all.
Note that nums <- seq_len(3) is an alternative way of creating the vector nums.

nums <- 1:3
row <- setNames(nums, paste0("Column", nums))
as.data.frame(t(row))
#>   Column1 Column2 Column3
#> 1       1       2       3

^{Created on 2023-06-03 with reprex v2.0.2}