On Sep 15, 2012, at 7:15 PM, mcg wrote:
> Hello R-users,
>
> I would like to use subscript in chemical formulas for the different
> treatments in a boxplot.
> Fot title, xlab and ylab sub- and superscript is no problem, but for the
> different treatments of the following example I cannot get subscript.
>
> Example:
> weight <- c(6,5,7,2,7,3,9,4,2,7,8,9,2,3,4,5)
> treatments <- as.factor(rep(c('Control', 'P2O5','K2SO4','CaSO4'),4))
> data <- data.frame(treatments,weight)
> boxplot(data$weight~data$treatments)
>
> If I apply expression(P[2]...) I get "unimplemented type 'expression' in
> 'HashTableSetup' ".
> If there is a solution for this in base graphics or ggplot please let me know.
>
?plotmath
boxplot(data$weight~data$treatments, xaxt="n")
axis(1, 1:4, labels=expression(Control, P[2]*O[5], K[2]*SO[4], CaSO[4]) )
I will admit that the need for the "*"'s was not apparent to me until I used
the initial example as a starting point and made incremental changes until I
gotsuccess. So I am not suggesting that RTM should have been enough.
--
David Winsemius, MD
Alameda, CA, USA
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