[R] plotmath: paste string and expression [from a vector of expressions]

[Marius Hofert]

Dear Uwe,

thanks for your help. Actually, I first thought about writing your solution in the email in order to make clear that it is not the solution I'm looking for :-) My goal is to work with the vector "vars" of expressions. The example is only a minimal example and for that your solution is perfectly fine, but my original problem is more complicated and there it makes sense to work with a vector of expressions. Do you know a solution to that? I tried many things... the obvious plot(0, 0, main=substitute(bold("Foo" ~~ VAR), list(VAR=vars[2]) )) did not work...

Cheers,

Marius

On 2011-06-02, at 22:14 , Uwe Ligges wrote:

> 
> 
> On 02.06.2011 20:43, Marius Hofert wrote:
>> Dear all,
>> 
>> I have a vector of expressions and would like to "paste" some string to it before using it in a plot:
>> 
>> vars<- vector("expression", 2)
>> vars[1]<- expression(alpha)
>> vars[2]<- expression(beta)
>> plot(0, 0, main=substitute(bold("Foo" ~~ VAR), list(VAR=vars[2]) ))
>> 
>> Although I tried hard, I just can't figure out how to solve this. The title should be "Foo<theta>", where<theta>  is the greek letter. I tried some constructions with bquote but that wasn't successful... I also looked in the mailing list but couldn't find anything helpful [I am sure I overlooked something].
> 
> 
> plot(0, 0, main=expression("Foo" ~~ theta))
> 
> Uwe Ligges
> 
> 
> 
>> Cheers,
>> 
>> Marius
>> 
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