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20 lines
406 B
Idris
20 lines
406 B
Idris
import Data.Fin
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import Data.Vect
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tail : (Fin (S n) -> a) -> (Fin n -> a)
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tail f = f . FS
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toVectFun : {n : Nat} -> (Fin n -> a) -> Vect n a
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toVectFun {n = Z} _ = Nil
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toVectFun {n = S m} f = (f FZ) :: (toVectFun (tail f))
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N : Nat
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N = 500
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xs : Vect (S N) Nat
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xs = toVectFun {n = S N} finToNat
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main : IO ()
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main = putStrLn $
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"xs(" ++ show N ++ ") = " ++ show (index (fromInteger (natToInteger N)) xs)
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