Pfthb

The data set i'm trying to declare would look something like,

$results[@"Key1"][@"Key2"] = @[int, int, int, int];

How would one declare this combination of NSDictionary & NSArray?

So as far as I understand it, you're looking for an array within a nested dictionary - so an array, within a dictionary, within another dictionary.

I would declare it like this:

NSMutableDictionary *firstDictionary = [[NSMutableDictionary alloc] init];
NSMutableDictionary *secondDictionary = [[NSMutableDictionary alloc] init];
NSArray *array = @[@1, @2, @3, @4];

[secondDictionary setObject:array forKey:@"key2"];
[firstDictionary setObject:secondDictionary forKey:@"key1"];

Then you can access the contents of your data structure like this:

NSArray *results = firstDictionary[@"key1"][@"key2"];

NSLog(@"results: %@", results);

And it will output:

results: (
 1,
 2,
 3,
 4
)

Hope this helps :)

Edit: just as an aside, if you're trying to create a 2d matrix, where you use 2 coordinates to access your data, then you should probably use a nested array, instead of a nested dictionary.