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, …)# S3 method for default
reorder(x, X, FUN = mean, …,
order = is.ordered(x))
an atomic vector, usually a factor (possibly
ordered). The vector is treated as a categorical variable whose
levels will be reordered. If x is not a factor, its unique
values will be used as the implicit levels.
a vector of the same length as x, whose subset
of values for each unique level of x determines the
eventual order of that level.
a function whose first argument is a vector
and returns a scalar, to be applied to each subset of X
determined by the levels of x.
optional: extra arguments supplied to FUN
logical, whether return value will be an ordered factor rather than a factor.
A factor or an ordered factor (depending on the value of
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.
This, as relevel(), is a special case of simply calling
factor(x, levels = levels(x)[....]).
# NOT RUN {
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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