[R] Insert row in specific location between data frames

[David Winsemius]

On Jul 1, 2012, at 1:33 AM, pigpigmeow wrote:

> 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

Yes, you are. The 'merge' operation requires that the two data.frames  
have some sort of identifier that labels the groups to be merged.

You should describe what you are attempting rather than showing failed  
efforts at doing it.

-- 

David Winsemius, MD
West Hartford, CT