Conditional `echo` (or eval or include) in rmarkdown chunks

Question

I would like to create an Rmarkdown document (pdf or html) that has some chunks \"executed\" conditionally. The particular case I have in mind is that I might want a more v

Answer 1

opts_chunk$set() is what you are after. Anything "set" will be the default for subsequent chunks (unless overwritten on a chunk-by-chunk basis)

```{r setup}
library(knitr)
opts_chunk$set(eval = TRUE, include= TRUE)
````

You can then alter as you see fit.