General ⇒ Appending text to equation numbers

[kyselad]

I'm trying to reformat my equation numbers to include a letter in front of each automatically numbered item. So instead of (1), (2), ... , I'm trying to get (S1), (S2) ...

I'm fussy, so:
1. I'd like to get this working with automatic numbering to facilitate referencing
2. The prefix needs to show up both in the equation itself and in subsequent references to the equation
3. It needs to work with both equation and eqnarray, so simply defining a new version of "equation" won't do the trick

This probably requires getting into the base-level formatting (especially to satisfy #3), and I can't seem to track down info on how to handle this. Any help is most appreciated.

Thanks,
Dave

[kyselad]

I must have spent 2 h on this before posting, then figured it out minutes later. Figures.
Anyway, in case anyone else stumbles upon this looking for the solution:

\renewcommand{\theequation}{S.\arabic{equation}}

Putting this in the preamble solves the issue. Ridiculously simple.

Cheers,
Dave