[R] sort a list?

Erik Iverson iverson at biostat.wisc.edu
Tue Oct 7 19:00:17 CEST 2008

Since objects of class "list" in R can be made up of heterogeneous 
objects, sorting them does not make much sense.  For example, does "A", 
come before or after 1000, does a linear model summary come before or 
after pi?

If your data are all numeric, store them as a numeric vector, where sort 
works.  Vectors can be named in R, as in your example.

Also, 'order' does something different than 'sort'.

try the following:

x <- c(a = 1, b = 4, c = 2)

Hope that helps,

rkevinburton at charter.net wrote:
> I am trying to sort a list and the data is obiously not in the right format. I am trying:
> x <- list()
> x[["A"]] <- 1
> x[["B"]] <- 2
> order(x)
> But am getting:
> Error in order(x) : unimplemented type 'list' in 'orderVector1'
> How should I change the list so that it can be sorted? What kinds of objects (classes of objects) can be sorted?
> Thank you.
> Kevin
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