Brackets in .Rmd code blocks I am making some R markdown documents for my stats class.  I've noticed I get an error in some functions when I have a code block with {r}  instead of just r.  Like so...
``` r
this code will be fine
``` 

``` {r}
this code will have an error
```

When should I be using the brackets for codeblocks in .Rmd and when should I leave them out?
Does it work without a space between the ``` and the {r}? It may be that the Rmd processor is getting confused about the spaces, but ignoring the bare r, and assuming the code is R by default.
The examples here don't have spaces:
https://rmarkdown.rstudio.com/lesson-3.html