Try this:
foo <- function(expr, x){
eval(substitute(expr))
}
foo(x^2, 4)
foo(x^3-10, 2)
On Fri, Sep 25, 2009 at 6:16 PM, njhuang86 <njhuang86 at yahoo.com>
wrote:>
> Hi. I was wondering how I can write a function that generates the outcome
> values for a user specified equation. For example, function(x^2, 4) will
> return back 16 and function(x^3 - 10, 2) will give back -2...
>
> I've been playing around with various lines of code but somehow, I just
> cannot get R to recognize the equation that I pass to it is just a random
> variable and doesn't need to be initialized...
> --
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>
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--
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O