On Tue, Oct 04, 2011 at 12:50:36PM -0400, Matthias Felleisen wrote: > > For testing, you want to use check-within because check-expects fails. > > For real programming, you actually want to use inequality comparisons, > so that they see how to program with Doubles elsewhere. > > For teaching abstraction, you may ask why repeat all these (<= n x n+epsilon) > everywhere. Oh, let's write inexact=?
Not sure what inexact=? does. What's needed is something like a three-argument function that tests |x-y| < epsilon. Epsilon should not be implicit. This can generalise to inexact points in any metric space, and the like. -- hendrik _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
