Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/JAMA/Matrix.php
public function minus(...$args)
    {
        if (count($args) > 0) {
            $match = implode(',', array_map('gettype', $args));

            switch ($match) {
                case 'object':
                    if ($args[0] instanceof self) {
                        $M = $args[0];
                    } else {
                        throw new CalculationException(self::ARGUMENT_TYPE_EXCEPTION);
                    }

                    break;
                case 'array':
                    $M = new self($args[0]);

                    break;
                default:
                    throw new CalculationException(self::POLYMORPHIC_ARGUMENT_EXCEPTION);

                    break;
            }
            $this->checkMatrixDimensions($M);
            for ($i = 0; $i < $this->m; ++$i) {
                for ($j = 0; $j < $this->n; ++$j) {
                    $M->set($i, $j, $M->get($i, $j) - $this->A[$i][$j]);
                }
            }

            return $M;
        }

        throw new CalculationException(self::POLYMORPHIC_ARGUMENT_EXCEPTION);
    }
public function minus(...$args)
    {
        if (count($args) > 0) {
            $match = implode(',', array_map('gettype', $args));

            switch ($match) {
                case 'object':
                    if ($args[0] instanceof self) {
                        $M = $args[0];
                    } else {
                        throw new CalculationException(self::ARGUMENT_TYPE_EXCEPTION);
                    }

                    break;
                case 'array':
                    $M = new self($args[0]);

                    break;
                default:
                    throw new CalculationException(self::POLYMORPHIC_ARGUMENT_EXCEPTION);

                    break;
            }
            $this->checkMatrixDimensions($M);
            for ($i = 0; $i < $this->m; ++$i) {
                for ($j = 0; $j < $this->n; ++$j) {
                    $M->set($i, $j, $M->get($i, $j) - $this->A[$i][$j]);
                }
            }

            return $M;
        }

        throw new CalculationException(self::POLYMORPHIC_ARGUMENT_EXCEPTION);
    }
minus.

A - B

@param mixed $B Matrix/Array

@return Matrix Sum