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Very simple question: I love writing R notebooks/markdowns, and with something like highlight: tango I can give background color to codes when I knit my notebook to pdfs.
However, I don't know how to give colored backgrounds or colored fonts to printed outputs in R. For example, suppose I have the following chunk.
```{r, echo = FALSE}
writeLines("Help")
```
I'd like to see the word Help to be highlighted, say in red font with gray background. How can I achieve this?
Many thanks in advance.
949
The Markdown syntax has no built-in method for changing text colors. We can use HTML and LaTeX syntax to change the formatting of words: For HTML, we can wrap the text in the <span> tag and set color with CSS, e.g., <span style="color: red;">text</span> . For PDF, we can use the LaTeX command \textcolor{}{} .
Rendering Output There are two ways to render an R Markdown document into its final output format. If you are using RStudio, then the “Knit” button (Ctrl+Shift+K) will render the document and display a preview of it.
Markdown doesn't support color but you can inline HTML inside Markdown, e.g.: <span style="color:blue">some *blue* text</span>. As the original/official syntax rules state (emphasis added): Markdown's syntax is intended for one purpose: to be used as a format for writing for the web.
with kableExtra, you can format your texts in R using text_spec
---
output: pdf_document
---
```{r}
library(kableExtra)
options(knitr.table.format = "latex")
```
`r text_spec("Help", color = "red")`
`r text_spec("Help Help", background = "#D05A6E", color = "white", bold = T)`
`r text_spec("Hello", font_size = 20)`
`r text_spec("World", angle = 180)`
You get
Same goes for HTML
See more in the Cell/Text Specification of the package vignette.
99
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