[R] Remove quotes from a string to use in a variable call

[dadrivr]

Hi,

I have a string that I want to use in a variable call.  How can I remove the
quotes and/or the string properties of the string to use it in a variable
call?

Here's an example:

library(lme)
fm2 <- lme(distance ~ age, data = Orthodont, random = ~ 1)
summary(fm2)

I want to update the above regression to include new predictors according to
what is in a string:

predictors <- "age + Sex"
update(fm2,fixed=distance ~ age + Sex) #this works
update(fm2,fixed=distance ~ noquote(predictors)) #this doesn't work

Any help would be greatly appreciated.  Thanks!

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