Title not showing on R Markdown with knitr when rendering markdown file

问题:

I am trying to convert a .Rmd file to .md (output: md_document), but the title does not show up on the rendered file.

The title does show up when I try to render the same file as an .html file (output: html_document).

Title shows up on rendered document:

--- title: "Test" output: html_document ---  ```{r}  head(cars) ``` 

Title does not show up on rendered document:

--- title: "Test" output: md_document ---  ```{r}  head(cars) ``` 

rmarkdown::render(my_file) 

Any ideas why?

I am using RStudio 0.98.1091 and R 3.1.2 on a Mac 10.9.5.

The code in between -- gets interpreted, as my references are rendered with the following piece of code:

--- title: "Test" output: md_document bibliography: ~/mybib.bib ---  This is a test where I cite [@post1, @post2] 

The interesting thing is that when I ask for both the html and md files to be generated, the title shows up on the .md file:

--- title: "Test" output:   html_document:     keep_md: yes --- 

Shouldn't the output of keep_md: yes be the same as output: md_document?

回答1:

Markdown does not have such a concept as "title". HTML has the <title> tag (and Pandoc also puts the title in <h1> for the HTML output from Markdown so you can see it from the HTML body), and LaTeX has the \title{} command. It is not unexpected to me that the YAML metadata (including the title info) is not reflected in the Markdown output.

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