Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/JAMA/Matrix.php
public function getMatrixByRow($i0 = null, $iF = null)
    {
        if (is_int($i0)) {
            if (is_int($iF)) {
                return $this->getMatrix($i0, 0, $iF + 1, $this->n);
            }

            return $this->getMatrix($i0, 0, $i0 + 1, $this->n);
        }

        throw new CalculationException(self::ARGUMENT_TYPE_EXCEPTION);
    }
public function getMatrixByRow($i0 = null, $iF = null)
    {
        if (is_int($i0)) {
            if (is_int($iF)) {
                return $this->getMatrix($i0, 0, $iF + 1, $this->n);
            }

            return $this->getMatrix($i0, 0, $i0 + 1, $this->n);
        }

        throw new CalculationException(self::ARGUMENT_TYPE_EXCEPTION);
    }
getMatrixByRow.

Get a submatrix by row index/range

@param int $i0 Initial row index
@param int $iF Final row index

@return Matrix Submatrix