how to merge two data.frames – only complete observations
On Nov 17, 2009, at 12:20 PM, Martin Batholdy wrote:
Hi, I have two data-frames like: A: USA 3.2 Canada 4.7 Austria 1.5 Iran 0.3 China 3.8 Japan 3.0 B: Austria 17 Iran 22 Angola 29 Japan 32 England 11 Now I want to merge this two data.frames to one - but I only want entries for the countries I have complete observations for; so the final data.frame should look like this: C: Austria 1.5 17 Iran 0.3 22 Japan 3.0 32 How can I do this?
See ?merge
> A
V1 V2
1 USA 3.2
2 Canada 4.7
3 Austria 1.5
4 Iran 0.3
5 China 3.8
6 Japan 3.0
> B
V1 V2
1 Austria 17
2 Iran 22
3 Angola 29
4 Japan 32
5 England 11
> merge(A, B, by = "V1")
V1 V2.x V2.y
1 Austria 1.5 17
2 Iran 0.3 22
3 Japan 3.0 32
HTH,
Marc Schwartz