ess-R-data-view is data viewer for GNU R. It shows dataframe and matrix on table view.
Put caret on a word that indicate dataframe or matrix, and
M-x ess-R-dv-ctable or
So, it popups other buffer containing table.
If its word is not dataframe or matrix, popup error message.
ess-R-dv-pprint have different features.
ess-R-dv-ctable shows table in other buffer. It includes border, and header is fixed.
ess-R-dv-pprint shows pretty-printed text in other buffer. It shows huge text smoothly.
ess-R-data-view uses other buffer, so it influences window layout. If you keep windows layout, you had better install window manager. popwin.el and e2wm.el is useful.