Internal links in rmarkdown don't work

Question

I use rmarkdown to render pdf documents. Now I want to add internal links in the texts.

In the helping pages of rmarkdown, it says an internal link is defined as:

Answer 1

There are some tricky rules for internal links in Rmarkdown PDF output, not well documented on cheat sheets, etc.

Rules:

• Only one # for anchor, even if you are using a header with multiple #.

  Example: ###header becomes #header when linking.

• No spaces between # and anchor text.

  Example: #header, not # header.

• Multi-word anchors should be separated by dashes.

  Example: #this is a header needs to become #this-is-a-header in the link.

• Anchor links need to be lowercase, even if the header you are linking to has capitalization.

  Example: #Section becomes #section in the link.