protected SumDifferenceSet combinePowers(SumDifferenceSet newSet)
{
for (int i = 0; i < newSet.Count - 1; i++)
{
bool baseAIsNegative = newSet._unitOperatorPair[i].Unit.GetSign().IsNegative();
IBase baseA = newSet._unitOperatorPair[i].Unit.GetBase();
IBase powerA = newSet._unitOperatorPair[i].Unit.GetPower() ?? new PrimitiveUnit(1);
IBase baseB = newSet._unitOperatorPair[i + 1].Unit.GetBase();
IBase powerB = newSet._unitOperatorPair[i + 1].Unit.GetPower() ?? new PrimitiveUnit(1);
bool baseSignIsSame = newSet._unitOperatorPair[i].Unit.GetSign().Equals(newSet._unitOperatorPair[i + 1].Unit.GetSign());
bool isSum = (newSet._unitOperatorPair[i + 1].OperatorEquals(Query.ADD));
bool baseIsSame = baseA.GetBase().Equals(baseB.GetBase());
bool exponentIsSame = powerA.GetBase().Equals(powerB.GetBase());
bool powerSignIsSame = powerA.GetSign().Equals(powerB.GetSign());
// (1a) Same Base, Same exponent, Same exponent sign
if (baseIsSame && exponentIsSame && powerSignIsSame)
{
if ((isSum && baseSignIsSame) ||
(!isSum && !baseSignIsSame))
{ // Add Exponent Same Sign
ProductQuotientSet newBasePower = new ProductQuotientSet(2);
newBasePower.MultiplyItem(new ProductQuotientSet(baseA, powerA));
newSet = new SumDifferenceSet(newBasePower, null, baseAIsNegative);
}
else
{ // Subtract Exponent Same Sign
newSet = new SumDifferenceSet(0);
}
}
// (1b) Same Base, Same exponent, Different sign
// (2) Same Base, Different exponent (ignore sign)
// (3) Different Base, Same exponent (ignore sign)
// (4) Different Base, Different exponent (ignore sign)
if (!baseIsSame && !exponentIsSame)
{
// Do Nothing
}
}
// Calculate if numeric
IBase power = newSet.GetPower();
if (power == null || !power.IsNumber())
{
return(newSet);
}
power = new PrimitiveUnit(power.Calculate());
newSet = new SumDifferenceSet(
new ProductQuotientSet(newSet.GetBase(), power, newSet.SignIsNegative())
);
return(newSet);
}
/// <summary>
/// Calculates the specified base value.
/// </summary>
/// <param name="baseValue">The base value.</param>
/// <returns>System.Double.</returns>
protected double calculate(double baseValue)
{
if (_power == null)
{
return(_sign * baseValue);
}
double powerValue = _power.Calculate();
return((Math.Abs(baseValue) < Tolerance && Math.Abs(powerValue) < Tolerance) ?
double.NaN :
Math.Pow(_sign * baseValue, powerValue));
}