Magic squares of doubly even order: Difference between revisions
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m (→{{header|Haskell}}: (Tweaked the point at which the 'magic series' starts, for more natural indexing) |
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=={{header|Haskell}}==
<lang Haskell>
import Data.List (transpose)
magicSquare :: Int -> [[Int]]
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-- yields the truth table that we need
| isPowerOf 2 n =
magicSeries $ floor (logBase 2 (fromIntegral sqr))
-- where n is not a power of 2, we can replicate a
-- minimum truth table, horizontally and vertically
| otherwise = (concat $ concat $ concat $
scale $ fmap scale $ splitEvery 4 $ magicSeries
where scale = replicate $ quot n 4
------------------------------------------------------------------------
magicSeries :: Int -> [Bool]
magicSeries n
| n <= 1 = [True, False]
| otherwise = xs ++ (not <$> xs)
where
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