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Matthieu
Matthieu

Reputation: 90

Matlab using multiple containers.Map raises an Index exceeds matrix dimensions error

Here a sample code:

Class A:

classdef classA
    properties
        mapOfB
    end
    methods
        function self = classA(names)
            self.mapOfB = containers.Map();
            for i = 1:numel(names)
                self.mapOfB(names{i}) = classB(names);
            end
        end
    end
end

Class B:

classdef classB
    properties
        mapTest
    end
    methods
        function self = classB(names)

            self.mapTest = containers.Map();
            for i = 1:numel(names)
                self.mapTest(names{i}) = rand(1,3);
            end
        end              
    end   
end

main script:

names = {'one', 'two', 'three', 'four'};
a = classA(names);
a.mapOfB
a.mapOfB.keys
a.mapOfB('one')
a.mapOfB('one').mapTest
a.mapOfB('one').mapTest.keys
a.mapOfB('one').mapTest('one')

console output:

a.mapOfB('one').mapTest.keys

ans = 

    'four'    'one'    'three'    'two'

a.mapOfB('one').mapTest('one')
Error using subsref
Index exceeds matrix dimensions.

I don't understand why there is an index exceeds matrix dimensions error when I call a map item in a map. It is a Matlab limitation ?

Upvotes: 2

Views: 323

Answers (1)

xmo
xmo

Reputation: 785

This line, which is totally equivalent to "a.mapOfB('one').mapTest('one')", does not raise the error

builtin('_paren', a.mapOfB('one').mapTest, 'one')

Therefore it's not a "real" error, but a limitation on MATLAB's syntax or implementation of containers.Map's subsref() operator.

See also this popular question

Upvotes: 1

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