check-within http://docs.racket-lang.org/test-engine/index.html#(def._((lib._test-engine/racket-tests..rkt)._check-within))
On Tue, Oct 4, 2011 at 1:48 PM, Hendrik Boom <hend...@topoi.pooq.com> wrote: > 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 > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
