r - Index for for-loop not working well -

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i have 2 dataframe

dataframe a

a     1   4   7 b   b   2   5   8 c   c   3   6   9

dataframe b

a     10  13  16 b   b   11  14  17 c   c   12  15  18

i wish create new dataframe c retains first 2 column of a , add corresponding numeric elements column 3 5.

i used following code:

c<-data.frame(matrix(na, nrow=3, ncol=5))   (i in 1:5) {      if (i==1:2) {c[,i] <- a[,i]}      else        {c[,i] <- round((a[,i]+b[,i])/2,0)}  }  write.xlsx(c, "c.xlsx")

however, output looks follwing in excel

    x1  x2  x3  x4  x5 1     #n/a    11  17  23 2   b   #n/a    13  19  25 3   c   #n/a    15  21  27

i think there may wrong i==1:2 part, may know how should modify code?

thank you!

this might of 

a = read.table(header = f, stringsasfactors = f,  text  = "a     1   4   7 b   b   2   5   8 c   c   3   6   9")   b = read.table(header = f, stringsasfactors = f,  text  = "a     10  13  16 b   b   11  14  17 c   c   12  15  18")   # using loop:  c = data.frame(matrix(na, nrow=3, ncol=5)) (i in 1:5) {   if (i %in% 1:2) {c[,i] <- a[,i]}   else {c[,i] <- round((a[,i]+b[,i])/2,0)} }    # without loop:   c = cbind(a[,1:2], round((a[,3:5] + b[,3:5]) / 2, 0)) print(c) #   v1 v2 v3 v4 v5 # 1    6  8 12 # 2  b  b  6 10 12 # 3  c  c  8 10 14

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