What's the "big picture" of what you're trying to do? eval(parse(text
= )) is often a less than optimal idea.
Some guesses:
Are you trying to construct a formula object (in the strict sense of
something that you pass to a modeling function)?
Maybe lazy evaluation of the deparse(substitute(x)) flavor might help here?
Michael
On Sat, May 5, 2012 at 2:42 PM, Josh Browning
<rockclimber112...@gmail.com> wrote:
> Hello useRs!
>
> So, I have a random question. I'm trying to build a character string, then
> evaluate it. I think an example would be the easiest way to explain:
>
>
> kern.vec = c("rbfdot","polydot")
> for( j in 1:length( kern.vec ) )
> {
> formula = paste("ksvm( ind ~ . ,
> data=d.temp[,c(ind_col,dep_cols)], kernel =",kern.vec[j],", prob.model=T )")
> svm = eval( parse( text=formula ) )
> ...
> }
>
>
> The problem I always seem to have is that in the formula, I need to have
> quotes around "rbfdot" (for example). But, when I paste the expression
> together, it removes the quotes. Is there a better way to do this (or at
> least a way around this problem)? My method seems a bit kludgy :)
>
> Thanks for all your help!
>
> Josh
>
> [[alternative HTML version deleted]]
>
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