r - How to copy values from data.frames with different length? -

i'm trying extract specific values 1 data.frame another. frames have different length similar names (i.e. 'a'::'z' , 'a'::'w')

names <- letters[1:26]  df1 <- data.frame("name" = names[1:20],"value" = rnorm(20, mean = 4, sd = 1)) df2 <- data.frame("name" = names[1:26],"value" = rnorm(26, mean = 4, sd = 1))  df2$value2 <- df1[df2$name %in% df1$name,]$value 

the last line above not work produces following error:

error in `$<-.data.frame`(`*tmp*`, "value2", value = c(4.21005563122984,  :    replacement has 20 rows, data has 24 

any suggestions how produce this:

  name    value   value2 1    4.210056 5.918197 2    b 3.203976 4.485109 3    c 4.290336 4.210056 ...... 25   y 5.918197 na 26   z 3.861640 na 

df2$value2[df2$name %in% df1$name] <- df1$value