Automatically adjust large plots to fit page pdf output from rmarkdown

Question

I am having issues when knitting my rmarkdown file to PDF with large plots. The plots get cut when producing the PDF file.

The problem is that I can't find a way to automatically adjust the height and width of all the plots. As I am writing a very large report, I have several plots like this, thus adjusting them separately (through fig.width and fig.height) is out of question.

Is there any package/command that I should use in my YAML or preamble.tex file?

Minimal reproducible example:

---
output: pdf_document
---

## Large Plot

```{r}
library(meta)

data(Fleiss93)

##
m <- metabin(event.e, n.e, event.c, n.c,
              data = Fleiss93, studlab = study,
              sm = "RR", method = "I")

forest(m)
```

Answer 1

要更改默认设置，请将以下代码块放在文档的早期：

```{r include = FALSE}
knitr::opts_chunk$set(fig.height = 9, fig.width = 7)
```

你也可以使用类似的东西

```{r include = FALSE}
knitr::opts_chunk$set(out.height = "\\textheight",  out.width = "\\textwidth")
```

重新缩放图像以尝试完全填充页面。默认情况下knitr会阻止您更改纵横比，但如果您真的想要填充页面、失真和所有内容，请使用

```{r include = FALSE}
knitr::opts_chunk$set(out.height = "\\textheight",  out.width = "\\textwidth",
                      out.extra = "keepaspectratio=false")
```

我建议反对最后的选择；你的情节看起来真的很难看。

更普遍的是：knitr默认值非常好。knitr::opts_chunk$set()当您想要原始默认值时，需要明确指定您使用的每个更改。因此，对于这些奇怪的选项，将选项剪切并粘贴到需要它们的每个块中，并保留默认值可能不是不可能的。