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<?php namespace PhpOffice\PhpSpreadsheet\Calculation\Financial; use PhpOffice\PhpSpreadsheet\Calculation\Exception; use PhpOffice\PhpSpreadsheet\Calculation\Functions; class InterestRate { /** * EFFECT. * * Returns the effective interest rate given the nominal rate and the number of * compounding payments per year. * * Excel Function: * EFFECT(nominal_rate,npery) * * @param mixed $nominalRate Nominal interest rate as a float * @param mixed $periodsPerYear Integer number of compounding payments per year * * @return float|string */ public static function effective($nominalRate = 0, $periodsPerYear = 0) { $nominalRate = Functions::flattenSingleValue($nominalRate); $periodsPerYear = Functions::flattenSingleValue($periodsPerYear); try { $nominalRate = FinancialValidations::validateFloat($nominalRate); $periodsPerYear = FinancialValidations::validateInt($periodsPerYear); } catch (Exception $e) { return $e->getMessage(); } if ($nominalRate <= 0 || $periodsPerYear < 1) { return Functions::NAN(); } return ((1 + $nominalRate / $periodsPerYear) ** $periodsPerYear) - 1; } /** * NOMINAL. * * Returns the nominal interest rate given the effective rate and the number of compounding payments per year. * * @param mixed $effectiveRate Effective interest rate as a float * @param mixed $periodsPerYear Integer number of compounding payments per year * * @return float|string Result, or a string containing an error */ public static function nominal($effectiveRate = 0, $periodsPerYear = 0) { $effectiveRate = Functions::flattenSingleValue($effectiveRate); $periodsPerYear = Functions::flattenSingleValue($periodsPerYear); try { $effectiveRate = FinancialValidations::validateFloat($effectiveRate); $periodsPerYear = FinancialValidations::validateInt($periodsPerYear); } catch (Exception $e) { return $e->getMessage(); } if ($effectiveRate <= 0 || $periodsPerYear < 1) { return Functions::NAN(); } // Calculate return $periodsPerYear * (($effectiveRate + 1) ** (1 / $periodsPerYear) - 1); } }