so I created an R markdown file as in File -> New File -> R Markdown.
It created a prebuild R markdown document and when I knit it to HTML with the below code.
Summary of (cars) and plot of pressure pops out. Looks good, works fine.
Are you putting the code inside a code chunk? do you have all the needed libraries installed? do you have loaded the libraries? Your code should look like this.
---
title: "test"
output: html_document
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(knitr)
library(kableExtra)
```
## R Markdown
This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.
When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:
```{r}
dt <- mtcars[1:5, 1:6]
kable(dt) %>%
kable_styling("striped", full_width = F) %>%
column_spec(5:7, bold = T) %>%
row_spec(3:5, bold = T, color = "white", background = "#D7261E")
```
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