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efrain |
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<?php
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namespace Matrix\Operators;
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use Matrix\Matrix;
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use \Matrix\Builder;
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use Matrix\Exception;
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use Throwable;
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class Multiplication extends Operator
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{
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/**
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* Execute the multiplication
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*
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* @param mixed $value The matrix or numeric value to multiply the current base value by
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* @throws Exception If the provided argument is not appropriate for the operation
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* @return $this The operation object, allowing multiple multiplications to be chained
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**/
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public function execute($value, string $type = 'multiplication'): Operator
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{
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if (is_array($value)) {
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$value = new Matrix($value);
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}
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if (is_object($value) && ($value instanceof Matrix)) {
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return $this->multiplyMatrix($value, $type);
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} elseif (is_numeric($value)) {
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return $this->multiplyScalar($value, $type);
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}
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throw new Exception("Invalid argument for $type");
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}
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/**
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* Execute the multiplication for a scalar
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*
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* @param mixed $value The numeric value to multiply with the current base value
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* @return $this The operation object, allowing multiple mutiplications to be chained
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**/
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protected function multiplyScalar($value, string $type = 'multiplication'): Operator
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{
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try {
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for ($row = 0; $row < $this->rows; ++$row) {
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for ($column = 0; $column < $this->columns; ++$column) {
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$this->matrix[$row][$column] *= $value;
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}
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}
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} catch (Throwable $e) {
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throw new Exception("Invalid argument for $type");
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}
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return $this;
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}
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/**
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* Execute the multiplication for a matrix
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*
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* @param Matrix $value The numeric value to multiply with the current base value
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* @return $this The operation object, allowing multiple mutiplications to be chained
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* @throws Exception If the provided argument is not appropriate for the operation
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**/
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protected function multiplyMatrix(Matrix $value, string $type = 'multiplication'): Operator
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{
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$this->validateReflectingDimensions($value);
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$newRows = $this->rows;
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$newColumns = $value->columns;
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$matrix = Builder::createFilledMatrix(0, $newRows, $newColumns)
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->toArray();
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try {
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for ($row = 0; $row < $newRows; ++$row) {
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for ($column = 0; $column < $newColumns; ++$column) {
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$columnData = $value->getColumns($column + 1)->toArray();
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foreach ($this->matrix[$row] as $key => $valueData) {
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$matrix[$row][$column] += $valueData * $columnData[$key][0];
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}
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}
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}
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} catch (Throwable $e) {
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throw new Exception("Invalid argument for $type");
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}
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$this->matrix = $matrix;
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return $this;
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}
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}
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