Beamer演示文稿RStudio更改块的字体大小 [英] Beamer presentation RStudio change font size for chunk

问题描述

我正在使用Knit PDF在RStudio中编译投影仪演示.

I am using Knit PDF to compile a beamer presentation in RStudio.

---
title: "A.P. Statistics"
author: "Notes for Chapter 3.Rmd"
date: "Monday, October 13, 2014"
output: beamer_presentation
---

## Computer Output

```{r}
summary(lm(cars$dist~cars$speed))
```

如何更改字体大小(仅针对这一块，其他块保持相同的字体大小)，以使此命令的输出适合一张幻灯片?

How can I change the font size (just for this one chunk, leaving other chunks the same font size) so that the output of this command fits on one slide?

推荐答案

一种解决方案是使用knitr 钩子.挂钩是将在执行块代码之前或之后运行的代码.您可以使用它在文件中插入LaTeX fontsize命令.

One solution is using knitr hooks. A hook is code that will run before or after the chunk code is executed. You could use it to insert a LaTeX fontsize command in the file.

```{r echo=FALSE}
knitr::knit_hooks$set(mysize = function(before, options, envir) {
  if (before) 
    return(options$size)
})
```

知道您可以通过以下方式更改大小

Know you can change the size by

```{r mysize=TRUE, size='\\large'}
1:10
```

一个缺点是这种钩子会影响幻灯片上的所有字体，即回显的R代码.尽管很麻烦，但您可以使用两个连续的块(第一个:echo，结果为否；第二个:没有echo，结果为)来规避这一点.

One Drawback is that this type of hook will affect all the fonts on a slide, i.e. also the echoed R-Code. Though cumbersome, you could use two consecutive chunks (1st: echo, results no; 2nd: no echo, results yes) to evade this.

```{r results="'hide'}
1:10
```

```{r echo=FALSE, mysize=TRUE, size='\\large'}
1:10
```

PS.通过修改输出挂钩而不是大块挂钩，也许是一种更好的方法.

PS. Maybe there is a better way by modifying output hooks instead of chunk hooks.

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