6 Jul
2013
6 Jul
'13
1:12 p.m.
On Fri, 5 Jul 2013, Twan van Laarhoven wrote:
I would like to make a counterproposal in the Enum Double debate: Instead of deprecating or removing the instances, how about just fixing them?
A perfect instance for Enum Double is not possible, because arithmetic is inexact. But you can actually get awfully close. I.e. instead of allowing the final value to be at most step/2 past the end, we can allow it to be at most about 2e-16*step past the end. In many practical applications this is close enough to not be a problem.
That is, it will make problems with numerical inaccuracies more seldom,
i.e. harder to detect?
Why is it important to use the enumFrom* functions, i.e. [x..] syntax? Why
not using 'takeWhile (