On Jul 2, 2010, at 2:05 AM, Joshua Wiley wrote:
Hello Jonathan,
You can use eval() and parse(), although there may be better ways of
getting to your end goal
> do.call(operator, list(a,b))
[1] 1
(assuming you have not inherited a series of
character strings held in objects that should be run as commands). At
any rate, this works:
a <- 3
b <- 2
operator <- "-"
statement_string <- paste(a, operator, b, sep="")
eval(parse(text = statement_string))
Best regards,
Josh
On Thu, Jul 1, 2010 at 2:54 PM, Jonathan Greenberg
<greenb...@ucdavis.edu> wrote:
Rhelpers:
How do I get R to evaluate a string, as if it was an R statement,
e.g.:
a=3
b=2
operator="-"
statement_string=paste(a,operator,b,sep="")
--j
David Winsemius, MD
West Hartford, CT
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