Hi Zemajik,
Try this:

> y <- function(a) paste(a, '*x', sep="")
> y(2)
[1] "2*x"

Also, take a look at the Ryacas package.

HTH,
Jorge


On Thu, Oct 1, 2009 at 9:46 AM, ZeMajik <> wrote:

> Hey,
> I'm trying to find how to perform operations with a variable treated as a
> symbol.
> For, an extremely simple, example I want to integrate a*x with respect to x
> and I want to find the indefinite integral of this, (a*x^2/2), or the
> definite integral with some interval for x.
>
> Another example of such a use would be to create a function
> y<-function(x) {a*x}
> and by typig y(2) I would get the result 2*a
>
> Is there a way to treat variables as merely "symbols"?
> Any help much appreciated
>
> -M
>
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