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：

将array[]转换为List<>

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

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;
}

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。

从数组对象

0 个答案: