question like this:
I have data tag and phi, when tag are the same, then phi are the same. like
below, tag have value 1 2 3 4 and phi have value .9 .3 1 0.
my question is, how can I get the result like
tag=c(1,2,3,4) and corresponding phi=c(.9,.3,1,0)
tag phi
2 .3
1 .9
2 .3
3 1
2 .3
1 .9
3 1
4 0
1 .9
2 .3
tag=c(2,1,2,3,2,1,3,4,1,2)
phi=c(.3,.9,.3,1,.3,.9,1,0,.9,.3)
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