[R] Peak finding algorithm

[Gene Cutler]

I'm sure there must be various peak-finding algorithms out there.  Not 
knowing of any, I have written one myself*, but I thought I'd ask to 
see what's out there.

Basically, I have a 2-dimensional data set and I want to identify local 
peaks in the data, while ignoring "trivial" peaks.  My naive algorithm 
first identifies every peak and valley (point of inflection change in 
the graph), then shaves off shallow peaks and valleys based on an 
arbitrary depth parameter, then returns whatever is left.  This 
produces decent results, but, again, I'd like to know what other 
implementations are available.

(* source available on request)