On May 6, 2014, at 2:51 PM, Tom Walker wrote:
> Hi,
>
> I need to generate bar charts where the x-axis is a factor that
> includes a mixture of species names (in italic) and control treatments
> (in plain text).
>
> I would like this to be represented in the contents of the axis
> labels, meaning that I need the x-axis to include both italic and
> plain text. An example of my failed attempt is below (the bins in the
> label list containing expressions become blank).
>
> d <- data.frame(Category = c("Sphagnum plant", "Calluna plant",
> "Eriophorum plant", "Control"),
> Response = c(1, 3, 5, 6))
>
> d
>
> mylabels <- list(expression(paste(italic("Sphagnum"), " plant")),
> expression(paste(italic("Calluna"), " plant")),
> expression(paste(italic("Eriophorum"), " plant")),
> "Control")
>
Just changing that assignment to create an expression vector instead of a list
works in R 3.1.0 Patched and ggplot2_0.9.3.1
mylabels <- c(expression(paste(italic("Sphagnum"), " plant")),
expression(paste(italic("Calluna"), " plant")),
expression(paste(italic("Eriophorum"), " plant")),
"Control")
> ggplot(d) +
> aes(x = Category, y = Response) +
> geom_bar() +
> scale_x_discrete(labels = mylabels)
>
> Any help would be much appreciated!
Thanks for providing complete example.
>
> Many thanks,
>
> Tom
>
> _
David Winsemius
Alameda, CA, USA
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