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


i create rmarkdown document (pdf or html) has chunks "executed" conditionally. particular case have in mind might want more verbose , documented version of output internal review colleagues, , shorter version external consumers. may not want or need show data manipulation steps client, key graphs , tables. not want make 2 separate documents or have manually indicate show or not.

is there way set switch @ beginning of rmd indicates, e.g., verbose=t run chunks or verbose=f toggles echo=f (or include=f)?

thank you.

knitr options can stated r expressions. per the "output" documentation on knitr webpage:

note options in knitr can take values r expressions, brings feature of conditional evaluation introduced in main manual. in short, eval=dothis means real value of eval taken variable named dothis in global environment; manipulating variable, can turn on/off evaluation of batch of chunks.

in other words if write chunks like:

```{r label} donextchunk <- as.logical(rbinom(1,1,.5)) ```  ```{r conditional, eval = donextchunk} "hello world!" ```

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