In an R Markdown (.Rmd) file, how do you comment out unused text? I'm not referring to the text in the R code chunk, but the general texts, like % in LaTex for example.
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user1981275
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aonan zhang
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2[Was initially closed as duplicate](https://stackoverflow.com/questions/4823468/comments-in-markdown); re-opening since Rmarkdown can potentially provide alternative options not supported by markdown. – baptiste Oct 23 '17 at 01:42
4 Answers
187
I think you should be able to use regular html comments:
<!-- regular html comment -->
Does this work for you?
user1981275
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6oddly, inline r code within those html comments tries to evaluate. e.g., `` can result in 'blah not Found' errors on Knit due to the inline code being unexpectedly evaluated. – Brian D May 01 '19 at 14:39
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I think I remember seeing Yihui Xie mention that having knitr recognize the comment characters would be too difficult because knitr is not responsible for rendering the document into html or pdf. I think the HTML comment characters are only dealt with by pandoc/rmarkdown after knitting. – randy Jul 12 '19 at 21:57
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Extra yaml blocks can be used anywhere inside the document, and commented out with #
---
title: "Untitled"
output: html_document
---
No comment.
---
# here's a comment
# ```{r}
# x = pi
# ```
---
Note however that this does not prevent knitr from evaluating inline r code.
baptiste
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After drag the lines you want to make comment, press SHIFT+CMD+C (macOS), SHIFT+CTRL+C (Windows). This is the shortcut of R Markdown editor (R Studio) to comment out.
z0nam
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2I'm running Windows 10, and for me it was also Ctrl+Shift+C. Thanks! – HelloGoodbye Sep 24 '19 at 20:41
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2@EvanRosica, HelloGoodbye, Thank you for your information, I edited my answer to add windows shortcut explicitly. – z0nam Mar 10 '20 at 06:12
