Inline code prints negative number without sign

[fkohrt]

---
title: "Inline test"
output: html_document
---

The following prints a positive(!) number: `r (-1) * 10^7`

...leads to...

xfun::session_info('knitr')

``` R version 4.3.1 (2023-06-16) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 20.04.6 LTS Locale: LC_CTYPE=C.UTF-8 LC_NUMERIC=C LC_TIME=C.UTF-8 LC_COLLATE=C.UTF-8 LC_MONETARY=C.UTF-8 LC_MESSAGES=C.UTF-8 LC_PAPER=C.UTF-8 LC_NAME=C LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=C.UTF-8 LC_IDENTIFICATION=C time zone: UTC tzcode source: system (glibc) Package version: evaluate_0.21 graphics_4.3.1 grDevices_4.3.1 highr_0.10 knitr_1.44 methods_4.3.1 stats_4.3.1 tools_4.3.1 utils_4.3.1 xfun_0.40 yaml_2.3.7 ```

---

By filing an issue to this repo, I promise that

• [x] I have fully read the issue guide at https://yihui.org/issue/.
• [x] I have provided the necessary information about my issue.
  • If I'm asking a question, I have already asked it on Stack Overflow or RStudio Community, waited for at least 24 hours, and included a link to my question there.
  • If I'm filing a bug report, I have included a minimal, self-contained, and reproducible example, and have also included xfun::session_info('knitr'). I have upgraded all my packages to their latest versions (e.g., R, RStudio, and R packages), and also tried the development version: remotes::install_github('yihui/knitr').
  • If I have posted the same issue elsewhere, I have also mentioned it in this issue.
• [x] I have learned the Github Markdown syntax, and formatted my issue correctly.

I understand that my issue may be closed if I don't fulfill my promises.

[cderv]

I think the issue comes from this function we use for printing

knitr:::format_sci((-1)*10^7)
#> [1] "10^{7}"

We use this function in inline hooks

https://github.com/yihui/knitr/blob/42f6b3ad75f8245d26c1de3d3e0b9fa018566af3/R/hooks-md.R#L204-L207

It seems there is several issues here:

• @yihui why do we latex as format and not HTML here ? It seems we should use html.

  knitr:::format_sci_one((-1)*10^7, format = "latex")
  #> [1] "10^{7}"
  knitr:::format_sci_one((-1)*10^7, format = "html")
  #> [1] "10<sup>7</sup>"

  Not sure I understand why we do length(pandoc_to()) == 1L then latex

• We still loose the minus sign does not seems right... https://github.com/yihui/knitr/blob/42f6b3ad75f8245d26c1de3d3e0b9fa018566af3/R/utils.R#L206-L207

  if not -1 we keep it

  knitr:::format_sci_one(-2*10^7, 'html')
  #> [1] "-2 &times; 10<sup>7</sup>"

  shouldn't we have a special case for -1 ?

  I am in doubt with your implementation of scientific notation https://github.com/yihui/knitr/blob/42f6b3ad75f8245d26c1de3d3e0b9fa018566af3/R/utils.R#L227-L229

  Should it be "-1 &times; 10<sup>7</sup>" or "-10<sup>7</sup>" ?

[yihui]

Should be fixed now. Thanks for the report!

---
title: "Inline test"
output: html_document
---

The following prints a positive(!) number: $`r (-1) * 10^7`$

Note that you need $ $ around the number.

[github-actions[bot]]

This old thread has been automatically locked. If you think you have found something related to this, please open a new issue by following the issue guide (https://yihui.org/issue/), and link to this old issue if necessary.