March 19, 2010
3:35 a.m.
On 3/18/2010 12:45 PM, Robert Kern wrote:
On 2010-03-18 13:27 PM, Glenn Linderman wrote:
As any non-naïve float user is aware, the proper form of float comparisons is not to use < or > or == or !=, but rather, instead of using < (to follow along with your example), one should use:
Decimal('1.1') - 2.2 < epsilon
Not at all. This is quite incorrect for most use cases. Fuzzy comparisons are sometimes useful for equality testing, but almost never for ordering.
I wondered if anyone would catch me on that! I did it mostly to keep the same example going, but partly to see if there were any real floating point experts in the discussion! You'll have noted my reference was to using the technique for equality.