On Wed, 2008-11-19 at 18:58 -0700, John Doty wrote: > On Nov 19, 2008, at 4:08 PM, Peter Clifton wrote:
> >> 2^32 nm is about 4.3 meters, large enough for any PCB I've ever seen. > >> 2^64 nm is about 0.12 astronomical unit ;-) > > > > Well.. I can't recall if we use signed or unsigned numbers throughout, > > so we might end up limited at half those. > > If it's signed, you can go 2.1 m either way, so it's the same. Depends.. if my world is 4.3 meters long, I can't make a signed vector across its span.. I'd have to be very careful when computing the difference in position between two points - I'd need one extra bit. -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user