On 08.01.2010, at 06:21, joel r wrote:
But right now I need some help. Either I'm using dist-m wrong, or it's
a bug I've found.
It's a bug. More specifically, a typo in a recent improvement. It is
fixed now, so please try again with the current version - or in fact
go back to an older version before December 28.
BTW, I suppose that instead of
(domonad dist-m
[a die
b die]
[+ a b])
you want
(domonad dist-m
[a die
b die]
(+ a b))
i.e. the distribution of the sum of two dice.
I modified dist-m to evaluate a map instead of a vector, like this:
(defmonad dist2-m
[m-result (fn m-result-dist [v]
{v 1})
m-bind (fn m-bind-dist [mv f]
(reduce (partial merge-with +)
(for [[x p] mv [y q] (f x)]
{y (* q p)})))
])
That's exactly the right fix!
Konrad.
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