在R Notebook中使用fig_height和fig_width设置图尺寸失效求助

Great question! This isn't a mistake on your part—it's a deliberate design difference between html_notebook and html_document in R Markdown. The fig_height and fig_width parameters in the YAML header don't work for html_notebook output, but they function as expected for html_document because of how each format handles rendering.

Why the difference? #

html_document generates a static HTML file, and the YAML configuration parameters are passed directly to knitr to apply global settings to all code chunks. On the other hand, html_notebook is an interactive format built for real-time editing and preview in RStudio. Its rendering logic prioritizes per-chunk settings over global YAML parameters for figure dimensions, so those YAML entries are ignored.

Two ways to set figure dimensions in R Notebook #

1. Per-chunk settings

Add fig.height and fig.width directly to individual R code chunks where you need to adjust figure size:

```{r fig.height=2, fig.width=2}
plot(cars)

#### 2. Global default settings
Set a global default for all code chunks using knitr's chunk options. Add this setup chunk at the very top of your notebook:
```r
```{r setup, include=FALSE}
knitr::opts_chunk$set(fig.height = 2, fig.width = 2)

The `include=FALSE` ensures this chunk runs in the background without appearing in your notebook output.

Either approach will give you the 2x2 figure dimensions you want in your R Notebook.

内容的提问来源于stack exchange，提问作者fallsit