[R] How to write string dynamicly?

[Gabor Grothendieck]

Try:

lda(iris[-5], iris[,5])

On 12/26/06, Feng Qiu <fqiu at gatech.edu> wrote:
> Hi everyone:
>         I'm trying to compose a string dynamicly for the parameter input of
> some function. For example:
> In package MASS, function lda() require to input the name of predictor
> variable. Let's say the 16th column is the predictor variable. Then we call
> the function like this: lda(V16~., data=mydata). I don't want to hard-code
> the call, instead, I would like to use a dynamic expression for this
> parameter so that I can use my program on different set of data.
>        I guess there,- are some function that can do this, but I didn't find
> it in "Introduction to R" so far, could someone please tell me this kind of
> function? Thank you!
>
> Best,
>
> Feng
>
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