I think the reason for the difference in the UGen is for signal processing reasons, where negative values should be retained for signals less then 0. There are a few other instances of this I think (though I can't remember them off the top of my head). I am pretty sure this is what James McCartney was referring to a ways back when he said the implementations in scsynth and in sclang SHOULD be different.
Josh
On Dec 17, 2009, at 10:33 AM, Tim Blechmann wrote:
the unit generator implements it as defined in wikipedia (according to
Graham, Knuth, & Patashnik) [2]:
x - floor(x)
the language as defined at wolfram [3] and the c99 modf function [4]:
x - trunc(x)
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