Limiting the number of decimals in a dataframe (R)

Question

I would like to limit the number of decimals when a data frame is imported. My .txt input have 16 decimals to each row in collumn \"Value\". My dataframe look like that:

Answer 1

Here is.num is TRUE for numeric columns and FALSE otherwise. We then apply round to the numeric columns:

is.num <- sapply(DF, is.numeric)
DF[is.num] <- lapply(DF[is.num], round, 8)

If what you meant was not that you need to change the data frame but just that you want to display the data frame to 8 digits then it's just:

print(DF, digits = 8)

In dplyr 1.0.0 and later one can use across within mutate like this:

library(dplyr)
DF %>% mutate(across(is.numeric, ~ round(., 8)))