Question

I made a matrix from list of list. How can I remove column ‘i’ and row ‘i’? Is there a method for that? I’ve tried RemoveAt but that’d remove one item.

List<List<int>> mtx = new List<List<int>>();

  0 1 2 3
  -------
0|0 0 0 0
1|0 0 0 0
2|0 0 0 0
3|0 0 0 0

For example I would like to delete row i=2

Answer 1

You have to do it in 2 times.

First remove the 1st dimension. (I like better to talk about dimensions than columns/rows which can be misinterpreted)

mtx.removeAt(i);

Then iterate over 1st dimension to remove your element on 2nd dimension.

foreach(List<int> list in mtx){
    list.removeAt(i);
}