In (info "(org) Column groups")
There's an example:
--8<---------------cut here---------------start------------->8---
| N | N^2 | N^3 | N^4 | sqrt(n) | sqrt[4](N) |
|---+-----+-----+-----+---------+------------|
| / | < | | > | < | > |
| 1 | 1 | 1 | 1 | 1 | 1 |
| 2 | 4 | 8 | 16 | 1.4142 | 1.1892 |
| 3 | 9 | 27 | 81 | 1.7321 | 1.3161 |
|---+-----+-----+-----+---------+------------|
#+TBLFM: $2=$1^2::$3=$1^3::$4=$1^4::$5=sqrt($1)::$6=sqrt(sqrt(($1)))
--8<---------------cut here---------------end--------------->8---
But it won't export (e.g. to html) correctly because [4] is interpreted
as a footnote. Here's a (trimmed down) backtrace :
--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (error "Definition not found for footnote 4")
signal(error ("Definition not found for footnote 4"))
error("Definition not found for footnote %s" "4")
org-export-get-footnote-definition
(...)
org-element-map
(...)
org-export-collect-footnote-definitions
org-html-footnote-section
org-html-inner-template
org-export-as
org-export-to-file
org-html-export-to-html
org-export-dispatch(nil)
call-interactively(org-export-dispatch nil nil)
--8<---------------cut here---------------end--------------->8---
Emacs : GNU Emacs 25.0.50.2 (i686-pc-linux-gnu, X toolkit, Xaw scroll bars)
of 2015-06-11 on Aurora
Package: Org-mode version 8.3beta (release_8.3beta-1216-gb856f6 @
/home/youngfrog/sources/org-mode/lisp/)
