I wanted to generate two images of different sizes, but show them side-by-side. Is this possible?
This works, but then they have to be the same size:
Another option, if you're outputting to HTML is to use the out.extra= chunk option, and set them to be float objects within a block. For example.
```{r fig.width=4, fig.height=6,echo=FALSE,out.extra='style="float:left"'}
plot(cars)
```{r fig.width=8, fig.height=6,echo=FALSE, out.extra='style="float:left"'}
plot(cars)
```