[R] legend mathematical annotation problem

[David Winsemius]

On Feb 13, 2010, at 1:13 PM, Mark Heckmann wrote:

> 1) I need to plot a legend containing the mathematical symbol  
> greater-than-or-equal sign.
> And I want the text to start with that symbol.
>
> plot(110, 0.8)
> categories <- expression(blank >= 85, 84.9 - 80, 79.9 - 75, 74.9 -  
> 70, 69.9 - 65, 64.9 - 60, blank< 60)
> legend(110, 0.8, categories, lty=1:7, lwd=3, col=1, merge=TRUE)
>
> What I want is just ">=85" to be printed, but without something  
> (here "blank") in front it is no correct expression.
>
> 2) Also I want German type decimals, that is a comma instead of a  
> point.
> But the problem is, that the comma is used as argument separator in  
> expression.
>
> plot(110, 0.8)
> categories <- expression(blank >= 85, 84,9 - 80, 79,9 - 75, 74,9 -  
> 70, 69,9 - 65, 64,9 - 60, blank< 60)
> legend(110, 0.8, categories, lty=1:7, lwd=3, col=1, merge=TRUE)

Try:
 > plot(110, 0.8)
 > categories <-legend(110, 0.8, c( expression("     ">= " 85"), "84,9  
- 80", "79,9 - 75", "74,9 - 70", "69,9 - 65", "64,9 - 60",  
expression("    "<" 60"))
+ , lty=1:7, lwd=3, col=1, merge=TRUE)

The commas inside quotes do not cause problems.

>
> This does obviously not work. Any ideas?
>
> Thanks,
> Mark
> –––––––––––––––––––––––––––––––––––––––
> Mark Heckmann
> Dipl. Wirt.-Ing. cand. Psych.
> Vorstraße 93 B01
> 28359 Bremen
> Blog: www.markheckmann.de
> R-Blog: http://ryouready.wordpress.com
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT