[R] Merging data.frames

[Mark Lamias]

On Tuesday, March 07, 2000 5:40 PM, Richard Bilonick wrote:


>I need to merge several data.frames into one data.frame. In S-Plus  I would
>use
>"merge" but I don't see a merge command in R. What is the best way to
>accomplish
>this?

The easiest way to to this, I think, is as follows:

if you have several data frames, dataframe1, dataframe2, . . . , dataframen,
you can merger them all into one dataframe by using the data.frame command
again with the individuaal data.frames as arguments:

	data.frame(dataframe1, dataframe2, . . . , dataframen)

here's a quick example:

> a1_c(1, 1, 1)
> a2_c(2, 2, 2)
> b1_c(3, 3, 3)
> b2_c(4, 4, 4)

> adf_data.frame(a1,a2)
> bdf_data.frame(b1,b2)
> adf+bdf
  a1 a2
1  4  6
2  4  6
3  4  6
> data.frame(adf, bdf)
  a1 a2 b1 b2
1  1  2  3  4
2  1  2  3  4
3  1  2  3  4
> data.frame(adf, bdf, adf)
  a1 a2 b1 b2 a1 a2
1  1  2  3  4  1  2
2  1  2  3  4  1  2
3  1  2  3  4  1  2

I hope this helps.

Mark J. Lamias
Department of Statistics
Department of Political Science
Survey Methodology Program/Survey Research Center
Institute for Social Research - University of Michigan
426 Thompson Street, Room 315
Ann Arbor, Michigan 48104-2321
(734) 647-5381
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