Update rows of data frame in R

Question

Suppose I start with a data frame:

 ID Measurement1 Measurement2
  1           45          104
  2           34           87
  3           23           99
           


        

Answer 1

library(dplyr)

df1 %>%
  anti_join(df2, by = "ID") %>%
  bind_rows(df2) %>%
  arrange(ID)