Create appendix with R-code in rmarkdown/knitr

Question

Is it possible to get all of the code in a appendix. Say I have two chunks in a document and then some text.

```{r, echo=TRUE}
x <- 4+5
x
```  
Above is X out         


        

Answer 1

You could use a reference to your initial chunks, but then change the options:

main text

```{r blah, echo = FALSE}
summary(cars)
```

appendix

```{r blah2, ref.label='blah', eval = FALSE}
```

Which will give: