46 lines
1.5 KiB
Julia
46 lines
1.5 KiB
Julia
module Powerset
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global _calculatedPowerSets = Matrix{Int64}(undef, 1, 0)
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global _grownUntil = 0
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function getPowerSet(setSize::Integer)
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wantedPowerSetSize = 2^setSize
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if setSize <= _grownUntil
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return _calculatedPowerSets[1:wantedPowerSetSize, 1:setSize]
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else
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currentPowerSetSize = 2^_grownUntil
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newPowerSets = zeros(Int64, wantedPowerSetSize, setSize)
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indices = CartesianIndices(_calculatedPowerSets)
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copyto!(newPowerSets, indices, _calculatedPowerSets, indices)
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for i ∈ (_grownUntil+1):setSize
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indicesTarget = CartesianIndices((2^(i-1)+1:2^i, 1:(i-1)))
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indicesSource = CartesianIndices((1:2^(i-1), 1:(i-1)))
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copyto!(newPowerSets, indicesTarget, newPowerSets, indicesSource)
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for j ∈ 1:currentPowerSetSize
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newPowerSets[currentPowerSetSize + j, i] = 1;
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end
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currentPowerSetSize *= 2
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end
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_calculatedPowerSets = newPowerSets
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_grownUntil = setSize
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return _calculatedPowerSets
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end
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end
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function getPowerSubSet(setSize::Integer, subSetSize::Integer)
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PowerSet = getPowerSet(setSize)
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setSizes = dropdim(sum(Powerset, dims = 2), dims = 2)
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powerSubSetSize = binomial(setSize, subSetSize)
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powerSubSets = Matrix{Int64}(undef, powerSubSetSize, setSize)
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j = 1
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for i ∈ 1:setSize
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if setSizes[i] == subSetSize
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powerSubSets[j, :] = PowerSet[i, :]
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j += 1
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end
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end
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return powerSubSets
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end
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end
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