get a matrix of matrices from a while loop

PLease see attached file.

I am dealing with percoaltion theory for disease spread. My programme currently randomly immusies a percentage of the population and then infects one of them and the final programme lets the disease spread.

However I want to be able to call different stages of the disease spread from the final programme. I thought of doing this by calling each matrix created after every run in the loop called I_pop and put them into a matrix so i can easily call each partition of that matrix. however I dont know how to return all matrices from my loop and not just the one created at the end.

Any help would be appreciated.