isKey Determine whether containers.Map contains key
 
    TF = isKey(mapObj, KeySet) looks for the specified KeySet in the Map instance
    mapObj, and returns logical TRUE (1) for those elements that it finds, and
    logical FALSE (0) for those it does not. KeySet is a scalar key or cell
    array of keys. If KeySet is nonscalar, then return value TF is a
    nonscalar logical array that has the same dimensions and size as KeySet.
 
    Examples: 
    Check myMap and verify that it contains the key 'a':
 
        myMap = containers.Map({'a', 'b', 'c'}, {'Boston', 'New York', ...
            'Natick'}); 
        hasKey = isKey(myMap, 'a'); 
        hasKey = 
     		1
 
    Check the same Map for two keys: 'a' and 'z'. The value
    returned in hasKeys is a two-element array that shows that the first
    key has been found and the second has not:
 
        hasKeys = isKey(myMap, {'a', 'z'})
        hasKeys = 
      		[ 1 0 ]
 
    
Help for CParameterList/isKey is inherited from superclass containers.Map