Hello all,
Here is my solution, in case someone else needs it.
I have a dataframe consisting of two columns.
col1<-factor(c("a","a","b","b","c","c"))
col2<-factor(c("a","b","c","d","e","f"))
somedf<-data.frame(col1,col2)
somedf
col1 col2
1 a d
2 a e
3 b f
4 b g
5 c h
6 c i
sample(col1,2,replace=T)
[1] b c
Levels: a b c
Now I want to sample from col2, but I want to restrict a vector I am
going to sample from to only those elements that correspond to col1
That
is, I want to take a sample from f, g, h, i. Elements corresponding
to
level a need to be dropped.
col1 col2
3 b f
4 b g
5 c h
6 c i
s <- sample(col1,2,replace=T)
col2[col1 %in% s]
Cheers,
Olga
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