reading ?plotmath you might notice that "_" isn't the propper syntax for
subscripts. This will work:
ggtern(data=x11,aes(A,B,C,xend = c(0.7,.00,0.7),yend =
c(.30,.50,.0),zend =c(.0,.50,0.3)))+
geom_point()+
theme_showarrows()+geom_segment(size=.5)+
geom_text_viewport(x=c(.45,.27,.37),y=c(.32,.29,.22),label=c("P[a]","P[b]","P[c]"),
parse=TRUE)
cheers.
Am 04.12.2017 um 15:37 schrieb Levent TERLEMEZ via R-help:
> Hi,
>
> My example code is this;
>
> x11<-data.frame(A=c(.6,.6,.6),B=c(.20,.20,.20),C=c(0.20,.20,.20))
> ggtern(data=x11,aes(A,B,C,xend = c(0.7,.00,0.7),yend = c(.30,.50,.0),zend
> =c(.0,.50,0.3)))+
> geom_point()+
> theme_showarrows()+geom_segment(size=.5)+
>
> geom_text_viewport(x=c(.45,.27,.37),y=c(.32,.29,.22),label=as.expression("P_a","P_b","P_c"))
>
> ggtern(data=x11,aes(A,B,C,xend = c(0.7,.00,0.7),yend = c(.30,.50,.0),zend
> =c(.0,.50,0.3)))+
> geom_point()+
> theme_showarrows()+geom_segment(size=.5)+
>
> geom_text_viewport(x=c(.45,.27,.37),y=c(.32,.29,.22),label=as.expression(quote(c("P_a","P_b","P_c"))))
>
> In geom_text_viewport (I also tried geom_label and geom_text versions) tried
> all possible solutions, but i couldn't achieved. R command outputs are like
> this:
>
> Error in stats::complete.cases(df[, vars, drop = FALSE]) :
> invalid 'type' (expression) of argument
>
>
> Maybe i am writing the code wrong, i couldn't figure out.
>
> Thanks for your kind answers.
>
>
>
> ________________________________________
> Kimden: Martin Maechler [maech...@stat.math.ethz.ch]
> Gönderildi: 04 Aralık 2017 Pazartesi 16:16
> Kime: peter dalgaard
> Bilgi: Levent TERLEMEZ; R-help@r-project.org
> Konu: Re: [R] ggtern and bquote...
>
>>>>>> peter dalgaard <pda...@gmail.com>
>>>>>> on Mon, 4 Dec 2017 14:55:19 +0100 writes:
>
> >> On 4 Dec 2017, at 11:58 , Levent TERLEMEZ via R-help
> >> <r-help@r-project.org> wrote:
> >>
> >> Dear Users,
> >>
> >> What is the proper way to write symbol, superscript,
> >> subscript in ggtern/ggplot? I tried every given example,
> >> every possible features of ggplot but couldn’t achived. I
> >> just want to write P_a, sigma^2, etc, would you please
> >> advise me about this problem.
>
> > Did you try expression(P_a)? I don't do much gg-stuff, but
> > I seem to recall that quote() doesn't quite cut it the way
> > it does in base graphics.
>
> > -pd
>
> Yes, I vaguely remember that indeed also for the lattice package
> (which is based on 'grid' the same as 'ggplot2' is ..) sometimes
> expressions instead of calls are needed, i.e., expression(*)
> instead of just quote(*).
>
> However, I think Levent really meant what you'd get by
> expression(P[a]) ?
>
> @Levent: The clue is the need for valid R syntax, and indeed, as
> in LaTeX x_i often is the i-th element of x, the R syntax for
> indexing/subsetting is used here, i.e.
> x[i] for LaTeX x_i
>
>
> Last but not least, if Levent really needs bquote() [i.e. substitute()]
> then, a final
> as.expression(.)
> may be needed :
>
> identical(as.expression(quote(a == 1)),
> expression( a == 1)) # --> TRUE
>
> --
> Martin Maechler, ETH Zurich
>
>
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