I don't understand why 'quantile' works in this case:
> tt <- rep(c('a','b'),c(10,3))
> sapply(0:6/6,function(q) quantile(tt,probs=q,type=1))
0% 16.66667% 33.33333% 50% 66.66667% 83.33333% 100%
"a" "a" "a" "a" "a" "b" "b"
and also
> quantile(tt,0:5/5,type=1)
0% 20% 40% 60% 80% 100%
"a" "a" "a" "a" "b" "b"
but gives an error in this, which I would have thought equivalent to the
first case above:
> quantile(tt,0:6/6,type=1)
Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) :
argument is not a numeric vector
I could of course write something like
sort(tt)[seq(1,length(tt),length.out=7)] -- but I'm wondering why quantile
fails in this case.
Thanks,
-s
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