user650654 user650654 - 27 days ago 10
R Question

In RStudio/RMarkdown, how to setwd?

setwd
in an Rmd file in RStudio does not appear to change the directory in subsequent chunks. Is there a way to set the working directory for good?

Example:

```{r}
setwd("/tmp")
getwd()
```

```{r}
getwd()
```


Output:

setwd("/tmp")
getwd()
## [1] "/private/tmp"

getwd()
## [1] "/Users/me/src"


This is on Mac OS 10.8.5 using RStudio 0.97.551, R version 3.0.2 and knitr version 1.5.

I wish to set the directory once for all subsequent chunks.

Answer

See Issue #277 and for further background, the package author's comments here

What you are looking for is the root.dir chunk option.

The following will set the root directory for this (and subsequent) code chunks

```{r setup}
opts_chunk$set(root.dir = '/tmp')
```

EDIT: RStudio 1.0.44

as of RStudio's latest release (Oct/Nov 2016), the following snippet is needed for knitr's render default:

```{r setup}
knitr::opts_knit$set(root.dir = '/tmp')
```

see Julienne's comment below.