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

Here is a simple way of doing internal links/references in an RMarkdown PDF document:

A) Create a section header:

## Homework Assignments{#hwks}

B) After creating the section header. I can refer to it in my text like this:

If you are having a hard time with your [homework](#hwks), we have some tutors who can help you. 

This creates a link back to the section header entitled "Homework Assignments".

Notice a couple of things in the way I set up the link:

1. "homework" ==> the word (or phrase) I use to call the header is in brackets

2. [homework] is immediately followed by the identifier "#hwks" that I created above, but the identifier is now in parentheses, as in: (#hwks)

This always works for me!

(This was my first post here; I hope it makes sense. :) )