Parameterised quarto book with R

[rleadbett]

Description

I'm trying to parameterise a Quarto book. I'm using R and so want to define the parameters in the yaml, for example:

params:
  alpha: 1
  beta: 0.05

However, if I do this in the _quarto.yml file for the book, when the chapters are being rendered, the params list can't be found. I get the following error:

Error:
! object 'params' not found
Backtrace:
    ▆
 1. ├─knitr::kable(...)
 2. └─tibble::tibble(...)
 3.   └─tibble:::tibble_quos(xs, .rows, .name_repair)
 4.     └─rlang::eval_tidy(xs[[j]], mask)

Quitting from index.qmd:11-22 [unnamed-chunk-1]
Execution halted

Whereas, if I specify params: in the yaml of the individual .qmd files, the book renders, but I can't render the book with alternative parameters using --execute-params params.yml:

Error in knit_params_get(input_lines, params) : 
  render params not declared in YAML: params
Calls: .main -> execute -> <Anonymous> -> knit_params_get
Execution halted

Is there a proper way I should be parameterising a book, or is this a feature that is not available yet?

I am working on a Windows 11 machine with quarto --version 1.7.32

[mcanouil]

Unfortunately, snippets are not very helpful to help you.
Please provide a small "working" example.

This being said, parameters are for documents not projects.

• https://quarto.org/docs/computations/parameters.html

You could try profiles: https://quarto.org/docs/projects/profiles.html
With R conditional logic.

[rleadbett]

Apologies, here is a simple example book.
demo-book.zip

The analysis requires multiple chapters, and I would like to be able to re-run the report with different parameter values.

[mcanouil]

Use environment variables and profiles.

• https://quarto.org/docs/projects/environment.html

[rleadbett]

Thanks!