Objective - c - NSMutableArray Array of Arrays

Question

I am developing an iphone app and I was wondering the following:

How do I initialise an NSMutableArray of NSMutableArrays to a certain size?

Sorry for the noob question

Answer 1

NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:5];

for (int i = 0; i < 5; i++) {
   NSMutableArray *innerArray = [[NSMutableArray alloc] initWithCapacity:5];

   [array addObject:innerArray];
}

Answer 2

You don't set a maximum size. You just keep addObject:'ing to them