Obviously Formula support is the single most wanted feature for Ruby-Spreadsheet. This will come, we just do not know when. In the meantime we fixed two bugs:
- Add missing Font-encoding
- Properly encode fragment mark in URLs
check it out at: http://scm.ywesee.com/?p=spreadsheet/.git;a=summary
The Ruby Spreadsheet 
FYI, the scm link is broken.
Comment by shawndrost — April 10, 2010 @ 2:22 am
@shawndrost the links works for me!
Comment by zdavatz — April 15, 2010 @ 6:29 am
Hi just want to say thanks for working on this gem. Hope formula support would work as currently it’s currently adding a total row or getting totals is a bit tricky.
Comment by katz — April 21, 2010 @ 2:19 am
=Sheet1!A1, rvoeme the Sheet1! so it says =A1, then drag the formula down and/or across. But this only works if all your formulas have the same format. Otherwise it’s a tedious manual task.
Comment by Takuya — February 3, 2012 @ 4:49 am