[R] how to write symbol (nabla) in R graph

[Dieter Menne]

Nuno Prista <nmprista <at> fc.ul.pt> writes:

> 
> Can anyone of you tell me how to write a "nabla" symbol in an R graph?
> 


I have not tested it, but according to

http://www.gnu.org/software/plotutils/manual/html_chapter/plotutils_10.html


nabla is Unicode [0321]

Check documentation on plothmath how to use it.

Note: the documents cited in plotmath are huge, and it would be nice to have
something like the gnu-reference I google for a short list.

Dieter