> -----Original Message-----
> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Jeff Newmiller
> Subject: Re: [R] Change the legend order by order function
>
> [snip]
>
> I cannot fathom why you think name_b, name_c, name_a is a
> natural result of using the order function that people will want to see.
> Either
> be explicit or use an alphabetic order, either way does not need the order
> function.
Things like 'high', 'med', 'low' also often need some care to avoid an
inappropriate alphabetical ordering.
ggplot (like many base graphics) will typically sort and display by level order
in a factor, not alphabetically.
So the key is to set the factor levels in the appropriate order in the first
place. If you define the factor level order explicitly on creating the factor,
as in
gp <- factor(<a vector>, levels=c("name_b", "name_c", "name_a"))
#or, for a more obviously likely example
lmh <- factor(sample(c("High", "Medium", "Low"), 30, replace=T),
levels=c("Low", "Medium", "High"))
ggplot will then display legends etc in the defined and now appropriate factor
level order by default.
S Ellison
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