Conditional evaluation of pieces within Rmarkdown

[blindglobe]

Hi all, a bit new here.

Is it possible to have a conditional evaluation of RMarkdown so that a single document could be both rendered as PDF as well as a Shiny app?

(for example, if a table provides input into a plot, the initial table contents would be used in the PDF, but the table could be edited to create different plots in the RMarkdown document).

I know I can write a preprocessor for a domain-specific language to generate both variants, but it would be great if such a conditional syntax (or even such a preprocessor) already existed, and I was just a clueless newbie.

best,
Tony

[cderv]

@blindglobe

Is it possible to have a conditional evaluation of RMarkdown so that a single document could be both rendered as PDF as well as a Shiny app?

Are you talking about conditional evaluation of chunks ?

Here is an example of a Rmd content to output differently in HTML and LATEX, and code evaluation is conditionnal to the output format at rendering

9.1 LaTeX or HTML output | R Markdown Cookbook

As you can make chunk conditonnal to any variables, you can even make some markdown content conditional

15.3 Execute content conditionally via the asis engine | R Markdown Cookbook

Does it helps to what you are looking for ? I am not sure if I understood correcly your need