Rstudio rmarkdown: both portrait and landscape layout in a single PDF

Question

I wonder how to use rmarkdown to generate a pdf which has both portrait and landscape layout in the same document. If there is a pure rmarkdown opt

Answer 1

Building upon previous solutions, the following solution does not require an auxiliary header.tex file. All contents are contained in the .Rmd file. The LaTeX commands are instead defined in a header-includes block in the YAML header. More info can be found here.

Also, I noticed that using the lscape LaTeX package rotates the contents of a page, but not the PDF page itself. This is resolved using the pdflscape package.

---
title: "Mixing portrait and landscape WITHOUT a header.tex file"
header-includes:
- \usepackage{pdflscape}
- \newcommand{\blandscape}{\begin{landscape}}
- \newcommand{\elandscape}{\end{landscape}}
output: pdf_document
---

Portrait
```{r}
summary(cars)
```

\newpage
\blandscape
Landscape
```{r}
summary(cars)
```
\elandscape

\newpage
More portrait
```{r}
summary(cars)
```