
reorder
is a generic function. The "default"
method
treats its first argument as a categorical variable, and reorders its
levels based on the values of a second variable, usually numeric.
reorder(x, ...)
"reorder"(x, X, FUN = mean, ..., order = is.ordered(x))
x
is not a factor, its unique values will be used as
the implicit levels.
x
, whose subset
of values for each unique level of x
determines the
eventual order of that level.
X
determined by the levels of x
.
FUN
order
), with the order of the levels determined by
FUN
applied to X
grouped by x
. The
levels are ordered such that the values returned by FUN
are in increasing order. Empty levels will be dropped.Additionally, the values of FUN
applied to the subsets of
X
(in the original order of the levels of x
) is returned
as the "scores"
attribute.
reorder.dendrogram
, levels
,
relevel
.
require(graphics)
bymedian <- with(InsectSprays, reorder(spray, count, median))
boxplot(count ~ bymedian, data = InsectSprays,
xlab = "Type of spray", ylab = "Insect count",
main = "InsectSprays data", varwidth = TRUE,
col = "lightgray")
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