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| 1 | + |
| 2 | +{-# LANGUAGE TypeOperators #-} |
| 3 | +{-# LANGUAGE MultiParamTypeClasses #-} |
| 4 | +{-# LANGUAGE FlexibleInstances #-} |
| 5 | + |
| 6 | +module Combination.Calculus where |
| 7 | + |
| 8 | +import Calculus.FunExpr |
| 9 | +import Calculus.DifferentialCalc |
| 10 | +import Calculus.IntegralCalc |
| 11 | + |
| 12 | +import Combination.Quantity |
| 13 | +import Dimensions.TypeLevel |
| 14 | + |
| 15 | +import Combination.Vector |
| 16 | + |
| 17 | +import Prelude hiding (length) |
| 18 | + |
| 19 | +-- FunExpr är redan Num-instans, så borde inte behöva göra detta, |
| 20 | +-- men pga okända anledningar funkar det ej |
| 21 | + |
| 22 | +instance Addable FunExpr FunExpr FunExpr where |
| 23 | + doAdd = (+) |
| 24 | + |
| 25 | +instance Subable FunExpr FunExpr FunExpr where |
| 26 | + doSub = (-) |
| 27 | + |
| 28 | +instance Multiplicable FunExpr FunExpr FunExpr where |
| 29 | + doMul = (*) |
| 30 | + |
| 31 | +instance Divisionable FunExpr FunExpr FunExpr where |
| 32 | + doDiv = (:/) |
| 33 | + |
| 34 | +-- Det intressanta är att den är Calculable! Num är faktiskt inte det |
| 35 | +-- så här blir det spännande. |
| 36 | + |
| 37 | +instance Calculable FunExpr where |
| 38 | + doDif = simplify . derive |
| 39 | + doInteg = simplify . integrate |
| 40 | + |
| 41 | + |
| 42 | +---------------------------------------- |
| 43 | +-- Exempel |
| 44 | +---------------------------------------- |
| 45 | + |
| 46 | +-- Ett flygplan med viss position är nedanstående |
| 47 | + |
| 48 | +g1 = V3 Id (Const 3 :* Exp) Sin ## length |
| 49 | + |
| 50 | +-- Dess hastighet är |
| 51 | + |
| 52 | +g2 :: Quantity (Length `Div` Time) (Vector3 FunExpr) |
| 53 | +g2 = diff g1 |
| 54 | + |
| 55 | +-- Dess acceleration är |
| 56 | + |
| 57 | +g3 :: Quantity ((Length `Div` Time) `Div` Time) (Vector3 FunExpr) |
| 58 | +g3 = diff g2 |
| 59 | + |
| 60 | +-- Det väger 120 kg |
| 61 | + |
| 62 | +g4 :: Quantity Mass FunExpr |
| 63 | +g4 = Const 120 ## mass |
| 64 | + |
| 65 | +-- Så nettokraften är |
| 66 | + |
| 67 | +g5 :: Quantity (Mass `Mul` ((Length `Div` Time) `Div` Time)) (Vector3 FunExpr) |
| 68 | +g5 = g4 *# g3 |
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