On 12-07-22 12:27 PM, Sverre Stausland wrote:
reorder() is probably the best way to order the levels in a vector
without manually specifying the order. But reorder() orders by default
in an increasing order: "The levels are ordered such that the values
returned by ‘FUN’ are in increasing order."
Is there a way to do what reorder() does, but order the levels
according to a _decreasing_ order of the values?
Yes, as Weidong suggested:
> x <- rnorm(20)
> y <- factor(sample(letters[1:3], 20, replace=TRUE))
> reorder(y, x, mean)
[1] a a c c c b b a b a c c b b a a a a c a
attr(,"scores")
a b c
-0.2012975 0.6117830 0.2180352
Levels: a c b
>
> reorder(y, x, function(x) -mean(x))
[1] a a c c c b b a b a c c b b a a a a c a
attr(,"scores")
a b c
0.2012975 -0.6117830 -0.2180352
Levels: b c a
Duncan Murdoch
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