figure temporisation in Rmarkdown beamer

Question

Trying Rmarkdown for the first time, I can't find anywhere how to do some basic beamer operations. I'd like for example to make a figure appear after some text in a slide, or replace a figure by another one, still inside a frame. How could I do this:

\only<1>{![](figureA.pdf)}
\only<2>{![](figureB.pdf)}

Can someone please give me the basics of slide temporisation with Rmarkdown?

Answer 1

Beamer has redefined various macros, including \includegraphics, to accept overlay arguments. You can use them in rmarkdown like this:

---
output: 
  beamer_presentation:
    theme: "CambridgeUS"
    keep_tex: true

---

# test

text

\includegraphics<+>[width=.5\textwidth]{example-image-a}
\includegraphics<+>[width=.5\textwidth]{example-image-b}