I create a set of slides using rmarkdown. I add a figure using latex includegraphics which works as expected. But, when I add a figure generate via R code, the ‘latex’ figure disappears.

Minimal code example

---
title: "TITLE"
author: "JS"
subtitle: SUBTITLE
output:
  beamer_presentation: 
    keep_tex: yes
  ioslides_presentation: default
fontsize: 14pt
---



# Example 

begin{figure}[t]
  centering
  includegraphics[scale=0.25]{include_figure}
end{figure}

---

# Add figure via R code

```{r, message = FALSE, warnings = FALSE, eval = TRUE, echo = TRUE}
plot(rnorm(100))

Any suggestions what I do wrong?