从数组对象

Question

从下面double array中删除多行是否有更好方法？

double[] RetDist;

HashSet<int> rowsToRemove = new HashSet<int> { 249, 250, 251,252,253,254,255,256,257,258,259,260,261,262,263,264,265,266,267,268,269};

RetDist = dataDist.Where((source, index) =>  !rowsToRemove.Contains(index)).ToArray();

主要关注：假设我要删除1000行（极端情况），手动指定效率可能非常低： < / p>

HashSet<int> rowsToRemove = new HashSet<int> { 249, 250,...};

编辑 - 到目前为止使用方式：

1. 将array[]转换为List<>

   List<double> Lretdist = RetDist.ToList();
   

2. 通过indexes删除系列method（我最初想要避免）

   List<double> test = RemoveIndexRowFromList(Lretdist, "m");
   
     public static List<double> RemoveIndexRowFromList(List<double> lst, string  obsfrequency)
   {
       int idx, totalrow, endindex, del;    
       totalrow = lst.Count;
   
       switch (obsfrequency)
       {
           case "d":
   
               idx = 1;
               endindex = totalrow - idx;
   
               while (endindex < totalrow)
               {
                   del = totalrow - 1;
                   lst.RemoveAt(del);
                   totalrow = lst.Count;
               }
   
               break;
   
           case "m":
   
               idx = 20;
               endindex = totalrow - idx;
   
               while (endindex < totalrow)
               {
                   del = totalrow - 1;
                   lst.RemoveAt(del);
                   totalrow = lst.Count ;
               }
   
               break;
       }
   
       return lst;
   }
   

3. 切换回array[]

   double[] Re = test.ToArray(); // and keep remaining computations using arrays
   

Ps ：我承认这3个额外步骤可能有点sub-optimal但是它 我想它比hard-coding要删除的行数要好一些。