Dear list,

Let's say we have a data frame as follows,

>expand.grid(a=1:5,b=c(1,5,10,20),DV=c(0.1,0.2,0.3))->df1
>df1$DV<-rgamma(60,shape=10)

columns a and b are two levels. DV is the column with values we are
interested in.

Then another data frame df2 with values as follows

data.frame(a=c(2,2,3,4,5),b=c(5,10,1,5,20))->df2

Now I want to a subset of df1 that match df2 at the both columns a and b.
Any idea?

Thanks.

Jun

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