The Epsilon class variable is used only when the primitives for some
float functions are not available, in which case they are approximated
to that precision. Using that same epsilon for something else is as
meaningless as the 0.0001 in #closeTo:.
The epsilon really depends on your application.
- Bert -
On 27.02.2009, at 13:41, Oscar Nierstrasz wrote:
Yes, we looked at that, but closeTo: uses a much larger epsilon than
Float's class variable Epsilon.
I suggested Camillo wrote an extension method similar to closeTo:
but using the existing Epsilon (or an arbitrary one as an additional
parameter).
Is that the right thing to do?
- on
On Feb 27, 2009, at 13:34, Lukas Renggli wrote:
Hi Camillo ;-)
Use the method #closeTo: instead of #=. Comparing floats with #=
almost never works.
Although "(Float halfPi / 2) tan" is printed as 1.0, it is not
exactly
1.0 due to rounding errors in the calucaltaion and/or the internal
representation.
(Float halfPi / 2) tan - 1.0 --> -1.110223024625156e-16
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch
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