在 RStudio 中的 R markdown 中，如何防止源代码从 pdf 页面运行? [英] In R markdown in RStudio, how can I prevent the source code from running off a pdf page?

问题描述

我目前有一些看起来像这样的代码:

I currently have some code that looks like so:

```{r, tidy=TRUE}
plot(DT$age, DT$height, xlab = "Age of participant in Trials", ylab = "Height of participant in       Trials")
```

现在，我的理解是，将 tidy 设置为 TRUE 会使得当我将代码编织在一起时，代码不会跑出页面并且会自行包装.但是，当我执行上述命令时，我仍然偶尔会运行源代码显示.是否有另一个函数可以保证代码的包装?谢谢！

Now, it was my understanding that setting tidy to TRUE would make it so that when I knit the code together, the code would not go running off the page and would wrap by itself. However, I sporadically still get run off source code displays when I do commands like the one above. Is there another function that would guarantee the wrapping of code? Thanks!

推荐答案

使用 tidy.opts knitr 选项中的 width.cutoff 参数来指定输出宽度:

Use the width.cutoff argument inside tidy.opts knitr options to specify the output width :

```{r, tidy=TRUE, tidy.opts=list(width.cutoff=60)}
plot(DT$age, DT$height, xlab = "Age of participant in Trials", ylab = "Height of participant in trials")
```

您可以使用这样的块为整个文件全局定义此选项:

You can define this option globally for your whole file with a chunk like this :

```{r}
library(knitr)
opts_chunk$set(tidy.opts=list(width.cutoff=60),tidy=TRUE)
```

tidy.opts 选项被传递给进行整理的 formatR 包(如果我理解正确的话).关于 formatR 的深入信息可以在这里找到:

The tidy.opts options are passed to the formatR package which does the tidying (if I understand correctly). In-depth informations about formatR can be found here :

http://yihui.name/formatR/

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