public static EsathCurrency PMT(ElfNumber rate, EsathNumber nper, EsathCurrency pv, EsathCurrency fv, EsathNumber type)
{
if (type != 0 && type != 1)
{
throw new ErroneousScriptRuntimeException(ElfExceptionType.OperandsDontSuitMethod, rate.VM);
}
if (rate is EsathCurrency)
{
throw new ErroneousScriptRuntimeException(ElfExceptionType.OperandsDontSuitMethod, rate.VM);
}
double result;
if (rate == 0)
{
if (nper == 0)
{
throw new ErroneousScriptRuntimeException(ElfExceptionType.DivisionByZero, rate.VM);
}
result = (-pv - fv) / nper;
}
else
{
result = (-pv * Math.Pow(1 + rate, nper) - fv) / ((1 + rate * type) * ((Math.Pow(1 + rate, nper) - 1) / rate));
}
return new EsathCurrency(result);
}
public static ElfNumber RoundDown(this ElfNumber n, EsathNumber digits)
{
var val = n is EsathPercent ? n.Val * 100 : n.Val;
return (ElfNumber)Activator.CreateInstance(n.GetType(), val.RoundDown((int)digits.Val));
}
