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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);
}
}