Rmarkdown Beamer 16:9 aspect ratio

Question

How to set the aspect ratio of beamer slides created using Rmarkdown in Rstudio to 16:9? It does not seem to be a standard option. I tried changing the \documentclass{} options using a header.tex insert but this was not successful.

Answer 1

Put the option in double quotes:

output: 
  beamer_presentation:
classoption: "aspectratio=169"

Notice that classoption keyword is at the same level with output.

• pandoc 1.19
• texlive 2015
• knitr 1.17
• rmarkdown 1.6