Values from NSString to NSMutableArray
===

I have a NSString with numbers e.g."1,3,6,7"
and a global NSMutableArray that is initialized elsewhere.

Now to get the numbers from the string to the Array I thought something like this would work:

    [myMArray arrayByAddingObjectsFromArray:([myString componentsSeparatedByString:@","])];

but it doesn't work. Can someone explain me why?