On Monday, May 25, 2015 at 10:16:02 PM UTC-7, Gary Herron wrote: > It's probably not the square root that's causing the inaccuracies. In > many other cases, and probably here also, it's the summing of two > numbers that have vastly different values that loses precision. A > demonstration: > > >>> big = 100000000.0 > >>> small = 0.000000001 > >>> (big+small)-big # Should produce a value =small, but gives an exact > zero instead. > 0.0 > > The squaring of the two values in x*x+y*y just makes the addition even > more error prone since the squares make large values even larger and > small values even smaller.
I appreciate your help. -- https://mail.python.org/mailman/listinfo/python-list
