[R] subset rows in two dataframes

[jim holtman]

This seems to work for me:

> set.seed(1)
> df1 <- data.frame(v1=factor(sample(1:4,20,TRUE)), v2=factor(sample(1:3,20,TRUE)), v3=sample(1:3,20,TRUE))
> df2 <- data.frame(v1=factor(sample(1:2,20,TRUE)), v2=factor(sample(1:2,20,TRUE)), v3=sample(1:2,20,TRUE))
> subset(df1, (df1$v1 %in% df2$v1) & (df1$v2 %in% df2$v2) & (df1$v3 %in% df2$v3))
   v1 v2 v3
2   2  1  2
5   1  1  2
11  1  2  2
14  2  1  1
>

Exactly what problems are you having?  A sample of your actual data
would be useful.

On Sat, May 10, 2008 at 6:31 PM,  <partofy at inoutbox.com> wrote:
> Dear list:
>
> I have two dataframes, say dat1 and dat2. Each has several variables but
> 3 of each are common in both, (say v1, v2 and v3). v1 and v2 are
> factores while v3 is numeric. Now, I need a subset to extract the rows
> in which v1, v2 and v3 are the same in both dataframes.
> I tried:
>
> subset(dat1, dat1$v1 %in% dat2$v1 & dat1$v2 %in% dat2$v2 & dat1$v3 %in%
> dat2$v3)
>
> I dont know why, but this is not working as I was expecting. Any
> suggestion to improve my code?
>
> Thanks in advance
>
> Justin
> --
>
>  partofy at inoutbox.com
>
> --
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?