Factors of an integer: Difference between revisions
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(→{{Header|Haskell}}: List comprehension) |
(→List comprehension: Factor, cofactor. Rearrange a list of tuples to a sorted list) |
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=== List comprehension === |
=== List comprehension === |
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Naive, functional, no import |
Naive, functional, no import |
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<lang Haskell> |
<lang Haskell>factors_naive n = [i | i <-[1..n], (mod n i) == 0]</lang> |
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<lang Haskell> |
<lang Haskell>factors_naive 6 |
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[1,2,3,6] |
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</lang> |
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Factor, cofactor. Rearrange a list of tuples to a sorted list |
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<lang Haskell>import Data.List |
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tuple_to_list lt = (fst lt) ++ (snd lt) |
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factors_co n = sort (tuple_to_list(unzip |
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[ (j, (div n j)) | j <- |
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[i | i <- |
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[1..truncate (sqrt (fromIntegral n))] |
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, (mod n i) == 0]] )) |
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</lang> |
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<lang Haskell>factors_co 6 |
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[1,2,3,6] |
[1,2,3,6] |
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</lang> |
</lang> |
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