[R-pkg-devel] Trouble with greek letter in figure title in R-devel

[Uwe Ligges]

On 14.11.2023 15:45, Ulrike Groemping wrote:
> Dear package developers,
> 
> I am struggling with an error on R devel (all flavors) that I cannot 
> reproduce with a freshly installed R-devel on my machine: Function 
> halfnormal in package DoE.base places the greek letter alpha in the 
> title of a figure. I changed the code to using plotmath about a month 
> ago (on CRAN request), and everything seemed fine then. Now, however, 
> R-devel produces an error message 
> (https://www.r-project.org/nosvn/R.check/r-devel-windows-x86_64/DoE.base-00check.html):
> 
> Error in title(...) :
>    conversion failure on 'Plot for rnorm.12., method = Lenth, α = 0.05' 
> in 'mbcsToSbcs': for α (U+03B1)

Yes, and your code contains

      titel <- bquote(paste("Plot for ", paste(xnam), ", method = ", 
.(method),
      ", \U03B1 = ", .(alpha), sep=""))


So please change this to plotmath as in the instance further above in 
your code where you already wrote

     titel <- as.expression(bquote("Plot for "*.(xnam)*", "*alpha == 
.(alpha)))


Best,
Uwe Ligges



> Calls: halfnormal ... <Anonymous> -> plot -> plot.default -> localTitle 
> -> title
> Execution halted
> 
> CRAN threaten to archive the package because of that error - so I would 
> really appreciate help on finding out what I should do (apart from nasty 
> things like writing alpha instead of using the greek letter).
> 
> The code in function halfnormal that creates the title in question looks 
> as follows:
> 
>    ## added August 1 5 2014, modified Oct 17 2023
>    if (is.null(titel)){
>       titel <- as.expression(bquote("Plot for "*.(xnam)*", "*alpha == 
> .(alpha)))
>       dots$main <- titel
>    }
> 
> The list dots is later used in "do.call(plotfun, dots)".
> 
> Any recommendations?
> 
> Thanks and regards,
> Ulrike
> 
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