[R] Insert row in specific location between data frames

[pigpigmeow]

i'm not success to insert row in specific location and merge another file

I have a question and I feel confused about the usage of "rbind", "cbind"
and "data.frame)

data 1:
> predict_SO2_a
    predict_SO2_a
1       39.793231
2       30.252578
3       32.467584
4       31.941509
5       27.908320
6       11.594137
7        9.368125
8       12.319093
9       11.558811
10       NA
11      11.211306
12      12.400342
13      12.393146
14      13.256160
15      10.709600
16       9.966334
17      28.850652
18      10.024405
data 2:
predict_SO2_b
 [1] 16.931975 18.286223 11.454404  6.256828  7.951174  5.364070  9.675208 
7.328439  9.957388 14.603543 14.605044  8.681327  9.450510 10.628049
13.178781 11.757256
[17] 23.820308

when I used "merge" and combine data1 and data2, it showed the error
Error in rbind(deparse.level, ...) : replacement has length zero.
I found the display of these two data are different. I'm confused





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