Hide comments in R markdown

Question

Is is possible to hide some comments in code when kniting using knitr / R markdown? Example:

--- title: "SOSO" author: "SO" date: '2017-06-06' output: pdf_document --- ```{r} # Generate some data rnorm(2) ## But keep this comment ```

When kniting I would like the first comment to disapear, but keep the second one somehow.

You could write a custom output hook that removes lines based on whatever criteria you would like. — Gregor Thomas
– Gregor Thomas, Commented Jun 6, 2017 at 20:25

fmic_ · Accepted Answer · 2017-06-06 22:46:41Z

Here is a quick example of modifying the hook to change knitr behavior.

--- title: "SOSO" author: "SO" date: 2017-06-06 output: pdf_document --- ```{r setup-hook, echo=FALSE} hook_in <- function(x, options) { x <- x[!grepl("^#\\s+", x)] paste0("```r\n", paste0(x, collapse="\n"), "\n```") } knitr::knit_hooks$set(source = hook_in) ``` ```{r} # Generate some data # Lines that starts with `# ` will be removed from the rendered documents rnorm(2) ## But keep this comment ## But lines that starts with `## ` will be kept ```

produces this

This strategy does not seem to work if sourcing from a separate R script using knitr::read_chunk

Yihui Xie · Accepted Answer · 2017-06-07 05:43:29Z

In fact, you can choose to show any lines of R code by passing numeric indices to the chunk option echo, e.g.

--- title: "SOSO" author: "SO" date: '2017-06-06' output: pdf_document --- ```{r echo=4:7} # Generate some data rnorm(2) ## But keep this comment ```

See knitr documentation for more information.

This is a far more elegant solution than the accepted answer. Though the accepted answer is quite clever.

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