xaringan 动态设置文档标题

Question

在r-markdown 中是一个将title: 移出主要yaml、as described in the R Markdown Cookbook 的选项。

但是，在xaringan 幻灯片设置中，新的--- 似乎与新幻灯片的想法相冲突。

下面的代码有效，但是当将第 2 行 title: "Presentation Ninja" 移到主 yaml 之外，并将其插入为 title: "The name of the dog is r dog_name!"，通过删除我在第 17 行中的所有 <!-- ... --> 代码-19，它无法正常工作。我不再得到标题页。我想我需要解决xaringan 中的---？

任何帮助将不胜感激！

---
title: "Presentation Ninja"
subtitle: "⚔<br/>with xaringan"
author: "Yihui Xie"
output:
  xaringan::moon_reader:
    lib_dir: libs
---
# xaringan set the document title dynamically
       
```{r, code=xfun::read_utf8('script_with_many_dog_names.R')}
```

The name of the dog is `r dog_name`!

<!-- --- -->
<!-- title: "The name of the dog is `r dog_name`!" -->
<!-- --- -->

Some bullets

- Foo

- Bar

Answer 1

你可以使用R Markdown参数：

1. 创建模板文件Template.Rmd

---
title: "The name of the dog is `r params$dog_name`"
subtitle: "⚔<br/>with xaringan"
author: "John Doe"
output:
  xaringan::moon_reader:
    lib_dir: libs
params:
    dog_name: NA
---



# xaringan set the document title dynamically

Some bullets

- Foo

- Bar

1. 设置dog_name参数后渲染模板：

source('script_with_many_dog_names.R')

# As an example, but it could be the result of previous script
params <- list(dog_name = 'Charles')

rmarkdown::render('Template.Rmd', output_file = 'presentation.html',
                  params = params,
                  envir = new.env(parent = globalenv())
)

Answer 2

您可以将逻辑直接添加到标题中，这对我来说似乎很好：

---
title: "The number is `r round(100 * runif(1), 2)`"
subtitle: "⚔<br/>with xaringan"
author: "Yihui Xie"
output:
  xaringan::moon_reader:
    lib_dir: libs
---