[R] Is there a plotmath symbol \mapsto?

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Dec 12 20:47:57 CET 2014

On 12/12/2014 19:40, David Winsemius wrote:
> On Dec 12, 2014, at 5:32 AM, Prof Brian Ripley wrote:
>> The only symbols plotmath has access to are those in the Adobe Symbol encoding.  You can display all of those using the example at the bottom of ?points, as ?plotmath did tell you.  (So it was a rather rich asking for an example.)
>> It also tells you that on some devices/platforms you can use Unicode escapes.
>> Now TeX (not LaTeX) does not define exactly which glyph \mapsto should output, but Unicode \u21A6 is often called 'mapsto' (how Unicode glyphs are rendered is font-specific, of course).  That works for me with cairo-based devices on Linux; however on my Mac that glyph is not in the standard fonts for Quartz-based devices.
> I did observe that I got failure to get that glyph to appear on a quartz or cairo_pdf device using either points() or text()  but this command did produce an error message that was able to find the glyph in the console font:
>> points(1,.8,"\u21A6")
> Error in plot.xy(xy.coords(x, y), type = type, ...) : invalid plot type '‚'
> In addition: Warning message:
> In plot.xy(xy.coords(x, y), type = type, ...) :
>    plot type '↦' will be truncated to first character

Hence my careful wording:  'the standard fonts for Quartz-based devices'.

I do not believe 'console font' is a well-defined quantity: perhaps you 
meant 'the default font of the R.app console', which many OS X users 
never use.  For a Terminal and R.app the font can be chosen by the user ....

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK

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