tests/testthat/examples/knitr-examples/121-ref-label.md

In parsermd: Formal Parser and Related Tools for R Markdown Documents

title: "Test ref.label and opts.label"

Chunk a

#>  [1] 2

#>  [1] 4

Chunk b

1:10

Setting opts_template

knitr::opts_template$set(skip = list(eval = FALSE), b = list(results = "markup",
    prompt = TRUE))

ref.label = 'a'

Ignore chunk options on chunk a:

1 + 1

## [1] 2

2 + 2

## [1] 4

ref.label = I('a')

Inherit chunk options from chunk a:

#>  [1] 2

#>  [1] 4

ref.label = 'a' and opts.label = TRUE

Inherit chunk options from chunk a:

#>  [1] 2

#>  [1] 4

ref.label = 'a' and opts.label = 'b'

Inherit chunk options from template b and then chunk b:

> 1 + 1
> 2 + 2

ref.label = c('b', 'a') and opts.label = TRUE

Inherit chunk options from chunk b (no output) and a (no source), so you see nothing below:

ref.label = I(c('b', 'a'))

Same as the previous section---you see nothing below:

ref.label = I(c('b', 'a')) and echo = TRUE

Inherit chunk options from chunk b (no output) and a (no source), and then override with echo = TRUE:

> 1:10
> 1 + 1
> 2 + 2

ref.label = c('b', 'a') and opts.label = 'a'

Inherit code from chunk b and a, and chunk options from chunk a (no source):

#>   [1]  1  2  3  4  5  6  7  8  9 10

#>  [1] 2

#>  [1] 4

ref.label = c('b', 'a') and opts.label = 'skip'

Inherit code from chunk b and a, and chunk options from template skip (no evaluation):

1:10
1 + 1
2 + 2

ref.label = I(c('b', 'a')) and opts.label = 'skip'

Inherit code from chunk b and a, and chunk options from template skip (ignore I() in ref.label since opts.label is not empty):

1:10
1 + 1
2 + 2

parsermd documentation built on Aug. 21, 2025, 5:27 p.m.