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<?php |
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namespace Wandu\Math\LinearAlgebra; |
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use InvalidArgumentException; |
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use Closure; |
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class Vector |
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{ |
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/** |
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* @param int $size |
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* @return static |
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*/ |
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public static function zeros($size) |
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{ |
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return new static(array_pad([], $size, 0)); |
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} |
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/** @var array */ |
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protected $items; |
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public function __construct(array $items) |
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{ |
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$this->items = $items; |
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} |
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/** |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return "Vector(" . implode(", ", $this->items) . ")"; |
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} |
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/** |
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* @param \Wandu\Math\LinearAlgebra\Vector $other |
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* @return number |
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*/ |
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public function dot(Vector $other) |
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{ |
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$this->checkCalculatable($other); |
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$result = 0; |
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foreach ($other->items as $key => $value) { |
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$result += $value * $this->items[$key]; |
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} |
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return $result; |
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} |
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/** |
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* @param \Wandu\Math\LinearAlgebra\Vector $other |
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* @return \Wandu\Math\LinearAlgebra\Vector |
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*/ |
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public function add(Vector $other) |
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{ |
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$this->checkCalculatable($other); |
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return $other->map(function ($item, $key) { |
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return $item + $this->items[$key]; |
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}); |
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} |
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protected function checkCalculatable(Vector $other) |
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{ |
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if (count($this->items) !== count($other->items)) { |
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throw new InvalidArgumentException('vector size is difference.'); |
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} |
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} |
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/** |
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* @param \Wandu\Math\LinearAlgebra\Vector $other |
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* @return bool |
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*/ |
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public function equal(Vector $other) |
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{ |
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return $this->items === $other->items; |
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} |
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/** |
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* @param number $other |
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* @return \Wandu\Math\LinearAlgebra\Vector |
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*/ |
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public function multiplyWithScalar($other) |
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{ |
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return $this->map(function ($item) use ($other) { |
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return $item * $other; |
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}); |
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} |
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/** |
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* @param \Closure $handler |
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* @return \Wandu\Math\LinearAlgebra\Vector |
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*/ |
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public function map(Closure $handler) |
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{ |
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$new = []; |
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foreach ($this->items as $key => $item) { |
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$new[$key] = $handler->__invoke($item, $key); |
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} |
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return new Vector($new); |
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} |
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} |
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Wandu /
Framework
