public double rec_Degree; // 该项目所对应的推荐度
// 排序算法
public int CompareTo(object other)
{
RecItemid_Degree otherTemperature = other as RecItemid_Degree;
if (this.rec_Degree == otherTemperature.rec_Degree)
{
return(0);
}
if (this.rec_Degree < otherTemperature.rec_Degree)
{
return(1);
}
return(-1);
}
/// <summary>
/// 根据用户支持的关联规则得到依据推荐度排序的推荐项目
/// </summary>
/// <param name="Supp_AssRules">用户所支持的关联规则集合</param>
/// <param name="userid">用户id</param>
/// <returns>推荐项目id&推荐度</returns>
public static RecItemid_Degree[] getRecItems(AssociationRule[] Supp_AssRules, int userid)
{
// 每个项目的推荐度
RecItemid_Degree[] temp_recDegree = new RecItemid_Degree[sourceUsers[userid].Ratings.Length];
int count_non_zero = 1;
for (int ItemID = 1; ItemID < sourceUsers[userid].Ratings.Length; ItemID++)
{
temp_recDegree[ItemID] = new RecItemid_Degree();
temp_recDegree[ItemID].recItems_id = ItemID;
temp_recDegree[ItemID].rec_Degree = 0; // 项目推荐度初始为零
// 循环扫描关联规则集，积累项目推荐度
for (int count_AR = 0; count_AR < Supp_AssRules.Length; count_AR++)
{
if (Supp_AssRules[count_AR]._itemid_2 == ItemID)
{
temp_recDegree[ItemID].rec_Degree += Supp_AssRules[count_AR].Reco_degrees;
}
}
if (temp_recDegree[ItemID].rec_Degree != 0)
{
count_non_zero++;
}
}
// 依据推荐度排序
Array.Sort(temp_recDegree);
recItems = new RecItemid_Degree[count_non_zero];
// 得到推荐度不为零的项，返回之
for (int count_rd = 1; count_rd < recItems.Length; count_rd++)
{
recItems[count_rd] = temp_recDegree[count_rd];
}
return(recItems);
}
/// <summary>
/// 根据用户支持的关联规则得到依据推荐度排序的推荐项目
/// </summary>
/// <param name="Supp_AssRules">用户所支持的关联规则集合</param>
/// <param name="userid">用户id</param>
/// <returns>推荐项目id&推荐度</returns>
public static RecItemid_Degree[] getRecItems(AssociationRule[] Supp_AssRules, int userid)
{
// 每个项目的推荐度
RecItemid_Degree[] temp_recDegree = new RecItemid_Degree[sourceUsers[userid].Ratings.Length];
int count_non_zero = 1;
for (int ItemID = 1; ItemID < sourceUsers[userid].Ratings.Length; ItemID++)
{
temp_recDegree[ItemID] = new RecItemid_Degree();
temp_recDegree[ItemID].recItems_id = ItemID;
temp_recDegree[ItemID].rec_Degree = 0; // 项目推荐度初始为零
// 循环扫描关联规则集，积累项目推荐度
for (int count_AR = 0; count_AR < Supp_AssRules.Length; count_AR++)
{
if (Supp_AssRules[count_AR]._itemid_2 == ItemID)
{
temp_recDegree[ItemID].rec_Degree += Supp_AssRules[count_AR].Reco_degrees;
}
}
if(temp_recDegree[ItemID].rec_Degree != 0)
{
count_non_zero++;
}
}
// 依据推荐度排序
Array.Sort(temp_recDegree);
recItems = new RecItemid_Degree[count_non_zero];
// 得到推荐度不为零的项，返回之
for (int count_rd = 1; count_rd < recItems.Length; count_rd ++ )
{
recItems[count_rd] = temp_recDegree[count_rd];
}
return recItems;
}
