[R] Combining Data Frames

[Henrique Dallazuanna]

Try this:

 x
        Datetime Temp
1 01/01/07 00:01 11.5
2 01/01/07 00:16 11.6

y
        Datetime Temp
1 01/01/07 00:01   10
2 01/01/07 00:16    3

merge(x, y, by="Datetime")
        Datetime Temp.x Temp.y
1 01/01/07 00:01   11.5     10
2 01/01/07 00:16   11.6      3



On 22/02/2008, stephen sefick <ssefick at gmail.com> wrote:
> I have two dataframes in R that were tab seperated .txt files
>
>  y<-read.table("foo.txt", header=T)
>  x<-read.table("foo.txt", header=T)
>
>  these are set up like this:
>
>  Datetime                 Temp
>  01/01/07 00:01         11.5
>  01/01/07 00:16         11.6
>
>  etc etc to 66000 rows in y and 33000 rows in x
>
>  The two files overlap with the same data for a period of time but
>  contain different values outside of these.  Is there a way to merge
>  these two data sets based on the shared date time column into one
>  large dataset of ~90,000 lines.  I want to eventually make this into a
>  time series with frequency= 1/15.
>
>  Thanks
>
>  Stephen
>  --
>  Let's not spend our time and resources thinking about things that are
>  so little or so large that all they really do for us is puff us up and
>  make us feel like gods.  We are mammals, and have not exhausted the
>  annoying little problems of being mammals.
>
>                                                                 -K. Mullis
>
>  ______________________________________________
>  R-help at r-project.org mailing list
>  https://stat.ethz.ch/mailman/listinfo/r-help
>  PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>  and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O