Transfer values from one dataframe to another

Question

I have two data frames. The first looks like this:

value <- seq(1, 100, length.out=20)
df1 <- data.frame(id=as.character(1:20), 
                  valu         


        

Answer 1

Just adding another approach to the existing list of excellent answers:

> library(dplyr)
> library(qdapTools)
> mutate(df2, v2 = id %l% df1)
#  id        v2
#1  1  1.000000
#2  2  6.210526
#3  3 11.421053
#4  4 16.631579
#5  5 21.842105
#6 21        NA
#7 22        NA
#8 23        NA