This is simple. Ensure that you store all of the matrices in one cell array C, then you can simply do this:
cat(3,C{:})
You can change the dimension to suit your needs. Also you can easily select how many you want to concatenate, by using simple and efficient indexing 1:N:
cat(3,C{1:N})
Note that accessing lots of separate variables inside a loop is very slow, complex and buggy:
