Created
November 6, 2016 06:30
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| import Html exposing (Html, div, text, button) | |
| import Html.App exposing (beginnerProgram) | |
| import Html.Events exposing (onClick) | |
| import Random exposing (Seed, initialSeed, step, float, bool) | |
| -- Start with initial probability | |
| -- For every miss : | |
| -- p = p * 0.9 | |
| -- For every hit : | |
| -- p = p + (1 - p) * 0.1 | |
| -- p = p * 0.8 + 0.2 | |
| -- State | |
| type alias State = | |
| { probability : Float | |
| , seed : Seed | |
| } | |
| -- Initialize with base probability | |
| initState : Float -> State | |
| initState p = | |
| { probability = clamp 0 1 p | |
| , seed = initialSeed 42 | |
| } | |
| -- Get next result | |
| next : State -> (State, Bool) | |
| next { probability, seed } = | |
| let | |
| genProb = float 0 1 | |
| (p, seed') = step genProb seed | |
| hit = p < probability | |
| prob = | |
| if hit | |
| then | |
| probability + (1 - probability) * 0.1 | |
| else | |
| 0.9 * probability | |
| nextState = | |
| { probability = prob | |
| , seed = seed' | |
| } | |
| in | |
| (nextState, hit) | |
| type alias Model = | |
| { state : State | |
| , hits : Int | |
| , misses : Int | |
| } | |
| init : Float -> Model | |
| init p = | |
| { state = initState p | |
| , hits = 0 | |
| , misses = 0 | |
| } | |
| update : Model -> Model | |
| update { state, hits, misses } = | |
| let | |
| (nextState, hit) = next state | |
| hits' = | |
| if hit | |
| then | |
| hits + 1 | |
| else | |
| hits | |
| misses' = | |
| if hit | |
| then | |
| misses | |
| else | |
| misses + 1 | |
| in | |
| { state = nextState | |
| , hits = hits' | |
| , misses = misses' | |
| } | |
| view : Model -> Html () | |
| view { state, hits, misses } = | |
| div | |
| [] | |
| [ div [] | |
| [ text ("Probability: " ++ toString state.probability) ] | |
| , div [] | |
| [ text ("Hits: " ++ toString hits)] | |
| , div [] | |
| [ text ("Misses: " ++ toString misses)] | |
| , button | |
| [ onClick () ] | |
| [ text "Next" ] | |
| ] | |
| main = | |
| beginnerProgram | |
| { model = init 0.19 | |
| , view = view | |
| , update = always update | |
| } |
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