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<?php namespace Matrix\Operators; use Matrix\Matrix; use Matrix\Exception; class Subtraction extends Operator { /** * Execute the subtraction * * @param mixed $value The matrix or numeric value to subtract from the current base value * @throws Exception If the provided argument is not appropriate for the operation * @return $this The operation object, allowing multiple subtractions to be chained **/ public function execute($value): Operator { if (is_array($value)) { $value = new Matrix($value); } if (is_object($value) && ($value instanceof Matrix)) { return $this->subtractMatrix($value); } elseif (is_numeric($value)) { return $this->subtractScalar($value); } throw new Exception('Invalid argument for subtraction'); } /** * Execute the subtraction for a scalar * * @param mixed $value The numeric value to subtracted from the current base value * @return $this The operation object, allowing multiple additions to be chained **/ protected function subtractScalar($value): Operator { for ($row = 0; $row < $this->rows; ++$row) { for ($column = 0; $column < $this->columns; ++$column) { $this->matrix[$row][$column] -= $value; } } return $this; } /** * Execute the subtraction for a matrix * * @param Matrix $value The numeric value to subtract from the current base value * @return $this The operation object, allowing multiple subtractions to be chained * @throws Exception If the provided argument is not appropriate for the operation **/ protected function subtractMatrix(Matrix $value): Operator { $this->validateMatchingDimensions($value); for ($row = 0; $row < $this->rows; ++$row) { for ($column = 0; $column < $this->columns; ++$column) { $this->matrix[$row][$column] -= $value->getValue($row + 1, $column + 1); } } return $this; } }