I recently started using ess for r. Emacs wiki shows that from version 12.09 ess by default includes support for auto complete. I am getting auto complete in the iess mode. But not completions in the ess mode. I tried setting completion to script only
(setq ess-use-auto-complete 'script-only)
but it did not work even then. I also tried adding ac sources by hand
(add-to-list 'ac-sources
ac-source-R-args)
(add-to-list 'ac-sources
ac-source-R-objects)
(add-to-list 'ac-sources
ac-source-R)
But to no benefit. Can someone please tell me what mistake I am making here? I am using GNU emacs 24.4.1 with ess 15.9.