/// <summary>
/// Gets a new Decision Vector where continuous elements have potentially been mutated.
/// Uses <see cref="IVariable"/> to wrap the added number, ensuring a valid Decision Vector is always created.
/// </summary>
/// <param name="decisionVector">The existing Decision Vector.</param>
/// <returns>A new Decision Vector.</returns>
/// <exception cref="ArgumentException">Thrown when Decision Vector is zero length or has no <seealso cref="VariableContinuous"/> elements.</exception>
public DecisionVector Operate(DecisionVector decisionVector)
{
var oldVectorContinuousElements = decisionVector.GetContinuousElements();
if (oldVectorContinuousElements.Count == 0)
{
throw new ArgumentException("Decision Vector must have continuous elements",
nameof(decisionVector));
}
var locationsToMutate = rngManager.GetLocations(
oldVectorContinuousElements.Count, maximumNumberOfMutations,
true, mutationProbability);
var newDv = new object[decisionVector.Count];
var newDs = decisionVector.GetDecisionSpace();
var offset = 0;
for (var i = 0; i < decisionVector.Count; i++)
{
newDv[i] = decisionVector.ElementAt(i);
// If variable is not continuous, just copy
if (newDs.ElementAt(i).GetType() != typeof(VariableContinuous))
{
offset++;
continue;
}
// Variable is continuous - it may be mutated multiple times.
var numTimesToMutate = locationsToMutate.Count(l => l == (i - offset));
for (var j = 0; j < numTimesToMutate; j++)
{
var mutationLocation = rngManager.Rng.Next(0, numberSet.Length);
newDv[i] = newDs.ElementAt(i).AddOrWrap(newDv[i], numberSet[mutationLocation]);
}
}
return(DecisionVector.CreateFromArray(newDs, newDv));
}