Peter wrote: > And how do you handle the precision of any non-rational numbers Like PI > for example ? Or anything that is not rational in the base you are using > for calculations ? pi = 3 +- 0.5; pi = 3.1 +- 0.05; pi = 3.14 +- 0.005; ... ?? Gerhard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist