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<?php |
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namespace drupol\phpartition\Algorithm; |
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use drupol\phpartition\BasePartitionAlgorithm; |
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use drupol\phpartition\PartitionAlgorithmInterface; |
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use drupol\phpartition\Subset; |
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use Math\Combinatorics\Permutation; |
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use Oefenweb\Statistics\Statistics; |
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/** |
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* Class BruteForceCustomA. |
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* |
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* @package drupol\phpartition\Algorithm |
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*/ |
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class BruteForceCustomA extends BasePartitionAlgorithm implements PartitionAlgorithmInterface { |
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/** |
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* @inheritdoc |
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*/ |
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public function getResult() { |
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$permutation = new Permutation(); |
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$this->dataset->sortByValue('ASC'); |
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$variance = pow(2, $this->dataset->count()); |
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foreach ($permutation->getPermutations($this->dataset->getItems(), $this->dataset->count()) as $subset) { |
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$subsetChunks = array_chunk($subset, $this->getPartition()); |
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$phpartitionSubsetSums = array(); |
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foreach ($subsetChunks as $items) { |
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$phpartitionSubset = new Subset(); |
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$phpartitionSubset->setItems($items); |
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$phpartitionSubsetSums[] = $phpartitionSubset->getWeight(); |
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} |
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$varianceCandidate = Statistics::variance($phpartitionSubsetSums); |
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if ($varianceCandidate < $variance) { |
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$variance = $varianceCandidate; |
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$best = $subsetChunks; |
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} |
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} |
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foreach($best as $subsetChunks) { |
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$subset = new Subset(); |
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$subset->setAlgo($this); |
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$subset->setItems($subsetChunks); |
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$this->getSubsetContainer()->insert($subset); |
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} |
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return $this->getSubsetContainer()->getSubsetsAndItemsAsArray(); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getSubsetWeight(Subset $subset) { |
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// Unused |
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} |
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} |
drupol /
phpartition
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Very long variable names usually make code harder to read. It is therefore recommended not to make variable names too verbose.