How to Hide Code in Rmarkdown, with Option to See It

How to hide code in RMarkdown, with option to see it

This has been made much easier with the rmarkdown package, which did not exist three years ago. Basically you just turn on "code folding": https://bookdown.org/yihui/rmarkdown/html-document.html#code-folding. You no longer have to write any JavaScript.

E.g.

---
title: "Habits"
output:
  html_document:
    code_folding: hide
---

Also see https://bookdown.org/yihui/rmarkdown-cookbook/fold-show.html for more control over which code blocks to be fold or unfold.

How to show code but hide output in RMarkdown?

As @ J_F answered in the comments, using {r echo = T, results = 'hide'}.

I wanted to expand on their answer - there are great resources you can access to determine all possible options for your chunk and output display - I keep a printed copy at my desk!

You can find them either on the RStudio Website under Cheatsheets (look for the R Markdown cheatsheet and R Markdown Reference Guide) or, in RStudio, navigate to the "Help" tab, choose "Cheatsheets", and look for the same documents there.

Finally to set default chunk options, you can run (in your first chunk) something like the following code if you want most chunks to have the same behavior:

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = T,
                      results = "hide")
```

Later, you can modify the behavior of individual chunks like this, which will replace the default value for just the results option.

```{r analysis, results="markup"}
# code here
```

toggle show/hide code in RMarkdown

From the answer to a similar question by Yihue -this functionality has now been added as code folding. See more at
http://rmarkdown.rstudio.com/html_document_format.html

Hiding the R code in Rmarkdown/knit and just showing the results

Sure, just do

```{r someVar, echo=FALSE}
someVariable
```

to show some (previously computed) variable someVariable. Or run code that prints etc pp.

So for plotting, I have eg

### Impact of choice of ....
```{r somePlot, echo=FALSE}
plotResults(Res, Grid, "some text", "some more text")
```

where the plotting function plotResults is from a local package.

RMarkdown button to show or hide code

@docendo discimus provided a link that answers the OP question. I'm including the code here for posterity purposes.

---
title: "test"
output: 
  html_document:
    code_folding: hide
---

Which produces the code folding button:

---

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