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

[David Winsemius]

On Jun 2, 2011, at 4:19 PM, Marius Hofert wrote:

> 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...

 > vars <- vector("expression", 2)
 > vars[[1]] <- quote(alpha)
 > vars[[2]] <- quote(beta)
 > plot(0, 0, main= bquote( paste("Foo ", .(vars[[2]] )) ) )

-- 
DAvid.
>
> 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
>>>
>>> ______________________________________________
>>> 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.
>
> ______________________________________________
> 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
West Hartford, CT