r - Merge unequal dataframes and replace missing rows with 0 -

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i have 2 data.frames, 1 characters , other 1 characters , values.

df1 = data.frame(x=c('a', 'b', 'c', 'd', 'e')) df2 = data.frame(x=c('a', 'b', 'c'),y = c(0,1,0)) merge(df1, df2)   x y 1 0 2 b 1 3 c 0

i want merge df1 , df2. characters a, b , c merged , have 0, 1, 0 d , e has nothing. want d , e in merge table, 0 0 condition. every missing row @ df2 data.frame, 0 must placed in df1 table, like:

  x y 1 0 2 b 1 3 c 0 4 d 0 5 e 0

take @ page merge. all parameter lets specify different types of merges. here want set all = true. make merge return na values don't match, can update 0 is.na():

zz <- merge(df1, df2, = true) zz[is.na(zz)] <- 0  > zz   x y 1 0 2 b 1 3 c 0 4 d 0 5 e 0

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