knitr chunk选项eval = TRUE，echo = TRUE，include = FALSE

Question

I use RMarkdown and knitr for dynamic report generation.

When knitting a document, I would like to have the code from an Rmarkdown chunk included in the knitted document and run the code -- but not show the output. That is, I would like to be able to do what this code suggests:

eval=TRUE, echo=TRUE, include=FALSE

... and make knitr run the code ( eval = TRUE ), show the code ( echo = TRUE ), but not show the lengthy output (attempted with include = FALSE ), but my attempts fail.

Does such an option exist with knitr ? Or is it possible to program this with a hook in knitr ?

(using only include=FALSE runs the code, but does not show the code.)

(Notification of cross-posting: I posted this question at RStudio support a week ago, but have not received any answer indicating yes or no, or how to achieve what I want).

Answer 1

If I am understanding your problem correctly, the issue is the include=F option. You should try instead to use results = "hide" . Here is how you can set it at the beginning of your Rmarkdown document so that it is the default setting.

```{r}
knitr::opts_chunk$set(eval = TRUE, echo = TRUE, results = "hide")
```