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December 16, 2015 20:10
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negate function for Exprs
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| negate' :: (Num a) => Expr a -> Expr a | |
| negate' (Var c) = (Const (-1)) :*: (Var c) | |
| negate' (Const a) = Const (-a) | |
| negate' (a :+: b) = (negate' a) :+: (negate' b) | |
| negate' (a :*: b) = (negate' a) :*: b | |
| negate' (a :^: b) = Const (-1) :*: a :^: b | |
| negate' (a :/: b) = (negate' a) :/: b |
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