On Wed, Feb 8, 2012 at 4:02 PM, moli <nird...@gmail.com> wrote:
> I want to evaluate f with the mean=7
>
> mean=7
> f <- expression(-(x-mean)^2/2)
> then get a new expression:
>
> -(x-7)^2/2
> How could I do it? Thanks.
>
You can leave out the initial as.expression if you don't mind having a
call object instead:
> as.expression(do.call("substitute", list(f[[1]], list(mean = 7))))
expression(-(x - 7)^2/2)
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