how to write latex in r markdown code example

Example 1: markdown in latex

% In your preamble
 
\usepackage[smartEllipses]{markdown}

% In the main body of your document

\markdownInput{example.md}

Example 2: markdown in latex

% In your preamble

\usepackage[hashEnumerators]{markdown}

% In the main body of your document

\begin{markdown}
### An h3 header ###

Now a nested list:

 1. First, get these ingredients:

      * carrots
      * celery
      * lentils

 2. Boil some water.

 3. Dump everything in the pot and follow
    this algorithm:

        find wooden spoon
        uncover pot
        stir
        cover pot
        balance wooden spoon precariously on pot handle
        wait 10 minutes
        goto first step (or shut off burner when done)

    Do not bump wooden spoon or it will fall.
\end{markdown}