Gaussian elimination: Difference between revisions
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===Determinant and permutation matrix are given=== |
===Determinant and permutation matrix are given=== |
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<lang Haskell> |
<lang Haskell>mult:: Num a => [[a]] -> [[a]] -> [[a]] |
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mult uss vss = map ((\xs -> if null xs then [] else foldl1 (zipWith (+)) xs). zipWith (\vs u -> map (u*) vs) vss) uss |
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foldlZipWith _ _ u [] _ = u |
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foldlZipWith _ _ u _ [] = u |
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foldlZipWith f g u (x:xs) (y:ys) = foldlZipWith f g (g u (f x y)) xs ys |
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foldl1ZipWith::(a -> b -> c) -> (c -> c -> c) -> [a] -> [b] -> c |
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foldl1ZipWith _ _ [] _ = error "First list is empty" |
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foldl1ZipWith _ _ _ [] = error "Second list is empty" |
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foldl1ZipWith f g (x:xs) (y:ys) = foldlZipWith f g (f x y) xs ys |
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multAdd::(a -> b -> c) -> (c -> c -> c) -> [[a]] -> [[b]] -> [[c]] |
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multAdd f g xs ys = map (\us -> foldl1ZipWith (\u vs -> map (f u) vs) (zipWith g) us ys) xs |
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mult:: Num a => [[a]] -> [[a]] -> [[a]] |
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mult xs ys = multAdd (*) (+) xs ys |
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triangle::(Fractional a, Ord a) => [[a]] -> [[a]] -> (a,[(([a],[a]),Int)]) |
triangle::(Fractional a, Ord a) => [[a]] -> [[a]] -> (a,[(([a],[a]),Int)]) |
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