Re: [Haskell-cafe] HANSEI in Haskell?

I see the problem now. But I am confused as to why there are no Bool class (like Num, Fractional...) in Haskell. If I had such a class then the problem is solved, (by making the "pm a" an instance of it) right? Or are there still more issues that I am not seeing? thanks, daryoush On Mon, Feb 28, 2011 at 7:34 AM, Chung-chieh Shan wrote:

Daryoush Mehrtash wrote in haskell-cafe:

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I am confused about this comment:

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Mostly we preferred (as do the domain experts we target) to write probabilistic models in direct style rather than monadic

In the haskell implementation of the lawn model there are two different version of the grassModel ( https://github.com/rst76/probability/blob/master/src/Lawn.hs)... By domain expert preferring direct style do you mean that they prefer the first version over the 2nd version?

No, there is no way to write probabilistic models in direct style in Haskell, and domain experts prefer neither Haskell version you showed.

A symptom of direct style is being able to write something like

flip 0.3 && flip 0.5

where (&&) takes two Bool arguments.

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