R help - Aug 2007 - converting character string to an expression

Hi Everyone,

I would simply like to coerce a character string into an expression:  
something like:

as.expression(paste(letters[1:3], collapse="+"))

but I can't seem to get rid of the quotes.  The only way I can get it  
to work is using as.formula:

as.expression(as.formula(paste("~", paste(letters[1:3],
collapse="+"))))

but this requires the expression to have a tilde, which it will not  
always have.

Thanks,

Jarrod

I think you're looking for

parse(text=paste(letters[1:3], collapse="+"))

--- Jarrod Hadfield <j.hadfield at shef.ac.uk> wrote:
> Hi Everyone,
> 
> I would simply like to coerce a character string into an expression:  
> something like:
> 
> as.expression(paste(letters[1:3], collapse="+"))
> 
> but I can't seem to get rid of the quotes.  The only way I can get it  
> to work is using as.formula:
> 
> as.expression(as.formula(paste("~", paste(letters[1:3],
collapse="+"))))
> 
> but this requires the expression to have a tilde, which it will not  
> always have.
> 
> Thanks,
> 
> Jarrod
> 
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>