Run Sweave or knitr with objects from existing R session

Question

Suppose I have an object x in my current session:

x <- 1

How can I use this object in an Sweave or knitr document, without

Answer 1

I think it just works. If your Sweave file is named "temp.Rnw", just run

> x <- 5
> Sweave("temp.Rnw")

You'll have to worry about naming the resulting output properly so each report doesn't get overwritten.