I find that figure settings applied with
opts_chunk$set don't work anymore with notebooks. I'm currently running RStudio version 1.2.1335.
The settings are applied if I manually knit to an html_document, but they aren't reflected in the RStudio source window, or in the html_notebooks that are produced upon saving.
Here are two chunks that I just tested in a notebook to confirm my findings. Many thanks!
library(knitr) library(ggplot2) opts_chunk$set(fig.height = 2, fig.width = 2)
ggplot(mtcars) + aes(hp, mpg) + geom_point()