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