Is there an R Markdown equivalent to \Sexpr{} in Sweave?

Question

Using R Markdown in knitr is there an equivalent to \\Sexpr{} in Sweave?

Answer 1

Yes. You can use

`r your_expression_here`

So something like

2+2 is: `r 2+2`

Should produce:

2+2 is: 4

I initially found it a little difficult trying to figure out what the different syntax was for each of the different styles you could use in knitr (html, markdown, sweave, ...) and resorted to looking at Yihui's minimal examples (which do a good job) but if you can read regular expressions you can view the default pattern definitions. You even have the option of defining your own syntax if you want.