Lah numbers: Difference between revisions
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(→{{header|Ruby}}: correction for (0,0) case) |
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def lah(n, k) |
def lah(n, k) |
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return 0 if n < 1 |
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case k |
case k |
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when 1 then fact(n) |
when 1 then fact(n) |
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when n then 1 |
when n then 1 |
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when (..1),(n..) then 0 |
when (..1),(n..) then 0 |
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else (fact(n)*fact(n-1)) / (fact(k)*fact(k-1)) / fact(n-k) |
else n<1 ? 0 : (fact(n)*fact(n-1)) / (fact(k)*fact(k-1)) / fact(n-k) |
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end |
end |
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end |
end |
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<pre>Unsigned Lah numbers: L(n, k): |
<pre>Unsigned Lah numbers: L(n, k): |
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n/k 0 1 2 3 4 5 6 7 8 9 10 11 12 |
n/k 0 1 2 3 4 5 6 7 8 9 10 11 12 |
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0 |
0 1 |
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1 0 1 |
1 0 1 |
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2 0 2 1 |
2 0 2 1 |
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siep@siep-desktop:~$ |
siep@siep-desktop:~$ |
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</pre> |
</pre> |
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=={{header|Sidef}}== |
=={{header|Sidef}}== |
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<lang ruby>func lah(n, k) { |
<lang ruby>func lah(n, k) { |
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