better call source(..., local=TRUE)

[shrektan]

From the documentation of ?source, we know that the local argument:

FALSE (the default) corresponds to the user's workspace (the global environment) and TRUE to the environment from which source is called.

It means if we call source() without specifying local=TRUE, the global environment will be polluted.

It has no differences if you just use RStudio IDE and click the knit button, as RStudio will evaluate the knit in a separate R session.

However, if you want to knit the Rmd file via R commands, local=TRUE is preferred, in my opinion.

Anyway, it's a very very trivial issue, please feel free to close it if you don't think it's necessary.

Thanks.