transform a df in dt in r

To convert a data.frame to a data.table in R, you can use the data.table() function from the data.table package. Here's an example:

main.r
library(data.table)

# create a sample data.frame
df <- data.frame(a = c(1, 2, 3), b = c(4, 5, 6))

# convert the data.frame to a data.table
dt <- data.table(df)

# print the data.table
print(dt)
196 chars
11 lines

In this example, we first create a sample data.frame df with two columns (a and b). We then use the data.table() function to convert df to a data.table dt. Finally, we print the resulting data.table with the print() function.

Note that when you transform a data.frame to a data.table, the resulting data.table is not a copy of the original data.frame. Instead, the data.table is created by reference, meaning that modifying the original data.frame will also modify the data.table, and vice versa.