I have recently setup polymode for use with Rnw and Rmd files.
When it came to knit/weave a document I was given the choice of four defaults; knitR-ESS, Sweave, knitR and Sweave-ESS.
I usually use knitR outside of emacs but I wondered what is the difference/advantage/disadvantage of using knitR-ESS over knitR, if any, when knitting documents?
Thanks.