Hi everyone,
I have a question on selecting and grouping elements of a data frame. For
example:
A.df<- [ a c 0.9
b x 0.8
b z 0.5
c y 0.9
c x 0.7
c z 0.6]
I want to create a list of a data frame that gives me the unique values of
column 1 of A.df so that i can create intersects. That is:
B[a]<- [ c 0.9]
B[b]<- [ x 0.8
z 0.5]
B[c]<- [ y 0.9
x 0.7
z 0.6]
B[c] n B[b] <- c(x,z)
How can I accomplish this?
Thanks,
Al
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