On Mon, Aug 16, 2010 at 3:25 PM, Don Guinn <dongu...@gmail.com> wrote:
> Residue gives the same.
>
>   5#:0j1+i.9
> 0j1 1j1 2j1 _2j1 _1j1 0j1 1j1 2j1 _2j1

And that is probably what is going on here.

Residue is defined to be using floor:

    The definition y-x*<. y % x+0=x extends the residue...

http://www.jsoftware.com/help/dictionary/d230.htm

And complex floor is the root issue here.

That said, the dictionary definition for #: does not
mention this issue, and this behavior does not make
sense for that definition.

-- 
Raul
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