Simple way to delete a matrix column in Mathematica

Question

I am trying to delete both a matrix in mathematica. An inelegant way of doing it is as I do below, i.e specifying it in a new matrix as

S = Table[
    Ss[[         


        

Answer 1

I think you are looking for:

Drop[Ss,{t},{t}]  

Timings:

ClearAll["Global`*"];

First@Timing[a = RandomInteger[1000, {5000, 5000}];]
0.34

First@Timing[Drop[a, {2}, {2}]]
0.11

While

First@Timing[Transpose@Delete[Transpose@Delete[a, 2], 2]]
0.5