Wondering how to include r snippet code from external file into quarto document.
The following code using knitr::read_chunk() works fine however, depends on knitr.
knitr::read_chunk("Ch02.R")
The following code using quarto code runs without any error but does not work as expected.
#| eval: true
#| output: false
#| file: Ch02.R
Wondering if there is any alternative in quarto for knitr::read_chunk().
If you want to include other code snippets, you could only use qmd files when using include:
Computational includes work only in .qmd files
Let's create a simple qmd file called create_dataframe.qmd which add a column to mtcars:
---
title: "Create dataframe"
---
```{r}
# Create data file
mtcars$new_col = sample(c(0,1), nrow(mtcars), replace = TRUE)
```
Now you can include that file in your main.qmd file like this:
---
title: "Document"
---
{{< include create_dataframe.qmd >}}
Let's check if extra columns is created:
```{r}
# View dataframe
head(mtcars)
```
Output:
As you can see, the column created in the create_dataframe.qmd file is now in your main file.
You could also the file option in your chunk like this. You have to make sure it evaluates the code using eval like this:
---
title: "Document"
---
Let's check if extra columns is created:
```{r}
#| echo: true
#| eval: true
#| file: create_dataframe.R
```
```{r}
# View dataframe
head(mtcars)
```
Output:
As you can see the new column is also in the dataframe.
You can use either source to just run the valid R code or use file to include the script as a chunk and evaluate
---
title: "Untitled"
format: html
---
## Include will interpret the content as markdown:
{{< include Chu1.R >}}
## Source will evaluate:
```{r}
#| echo: false
source("Chu1.R")
```
## file will echo and evaluate
```{r,file = "Chu1.R"}
```
You can use the include directive.
For example,
{{< include Ch02.R >}}
More details at https://quarto.org/docs/authoring/includes.html
