# [R] Is there a plotmath symbol \mapsto?

David Winsemius dwinsemius at comcast.net
Fri Dec 12 20:40:50 CET 2014

```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 plot.xy(xy.coords(x, y), type = type, ...) :
plot type '↦' will be truncated to first character

--
David.
>
>
> On 12/12/2014 03:38, Marius Hofert wrote:
>> Hi,
>>
>> Is there a plotmath symbol like LaTeX's \mapsto?
>> I need this comparably often, for example if you want to plot a
>> two-place function in one variable (and thus would like to have
>> ylab="t \mapsto f(t,s)", for example). If there is such a symbol, I'd
>> be great to have it as an example on ?plotmath.
>>
>> Thanks & cheers,
>>
>> Marius
>
>
> --
> 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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