Random row selection in R

Question

I have this dataframe

id <- c(1,1,1,2,2,3)
name <- c(\"A\",\"A\",\"A\",\"B\",\"B\",\"C\")
value <- c(7:12)
df<- data.frame(id=id, name=name, valu         


        

Answer 1

Here's one way of doing it in base R.

> df.split <- split(df, df$name)
> df.sample <- lapply(df.split, randomRows, 1)
> df.final <- do.call("rbind", df.sample)
> df.final
  id name value
A  1    A     7
B  2    B    11
C  3    C    12