private double GetRouteUtility(EdgeRoute er)
{
double iUtilitySum = 0;
foreach (var item in er)
{
iUtilitySum += tca.GetTripCost(item);
}
return(iUtilitySum);
}
/// <summary>
/// 使用离散选择模型中的logit模型进行路径的选择。
/// 返回1代表选择路径A，返回2代表选择路径B
/// </summary>
/// <returns></returns>
internal override int Select(EdgeRoute routeA, EdgeRoute routeB)
{
//第一个路径的路段效用和
double iUtilityA = this.GetRouteUtility(routeA);
//第二个路径的路段效用和
double iUtilityB = this.GetRouteUtility(routeB);
//logit中的分母
double dDevider = Math.Exp(iUtilityA) + Math.Exp(iUtilityB);
//logit 模型
double dProbA = 1 - Math.Exp(iUtilityB) / dDevider;
Random rd = new Random(0);
if (dProbA >= rd.NextDouble())
{
return(1);
}
return(2);
}
internal virtual int Select(EdgeRoute routeA, EdgeRoute routeB)
{
return(0);
}
