R code inside mathematical notation R Markdown

Question

In R Markdown, I can get a built-in snippet of r code that will execute inside a single notation $(only from *to), but not a double $$mathematical notation:

* $H_o = `r 1 + 1`$

works, but:

$H_o = `r 1 + 1`$

does not work, and does not:

$$H_o = `r 1 + 1`$$

Double is $$more flexible, able to put mathematical notation on several lines, but how can you add in-line code fragments inside?

Answer 1

, ! pdf github.md . rmarkdown.

R 3.4.1, knitr 1.16 rmarkdown 1.6.

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