Removing rows and columns from MATLAB matrix quickly

Question

Is there a fast way to remove rows and columns from a large matrix in MATLAB?

I have a very large (square) distance matrix, that I want to remove a number of rows/co

Answer 1

I think it will depend on your usage, but I have two ideas:

1. Make it a sparse matrix. The more you're removing the better this option will probably be.
2. Why do you need to remove the values? Could you maybe do:

A = D(randsample(s,2), randsample(s,2));
clear D;
% Use A