How to iterate and access over map key values

Question

Tabassum 2023-7-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1994273-how-to-iterate-and-access-over-map-key-values

回答： Diwakar Diwakar 2023-7-11

I have a map with some keys which has multiple number of values in it How can I access those values for each key.

these show the size of the array of the value but not the values itself.

for u = keys(mp)
    mu = values(mp,u);
    disp(mu)
    
    for v = mu
        disp(v);
    end
    
    disp('-----------ended------------------')
end

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Answer 1

Chunru 2023-7-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1994273-how-to-iterate-and-access-over-map-key-values#answer_1270883

在 MATLAB Online 中打开

mp = dictionary(["a1", "a2", "a3"], {1, [2 3], "str"})

mp =

dictionary (string ⟼ cell) with 3 entries: "a1" ⟼ {[1]} "a2" ⟼ {[2 3]} "a3" ⟼ {["str"]}

k = keys(mp);

v = values(mp)

v = 3×1 cell array

{[ 1]} {[ 2 3]} {["str"]}

for i = 1:length(v)

disp(v(i));

end

{[1]} {[2 3]} {["str"]}

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Answer 2

Diwakar Diwakar 2023-7-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1994273-how-to-iterate-and-access-over-map-key-values#answer_1270898

在 MATLAB Online 中打开

Check the below code may be help you.

% Create and populate the map
mp = containers.Map;
mp('key1') = [1, 2, 3];
mp('key2') = {'value1', 'value2', 'value3'};
mp('key3') = [10, 20, 30, 40];
% Iterate over each key in the map
for u = keys(mp)
    key = u{1};  % Extract the key from the cell array
    % Access the values associated with the current key
    valuesArray = mp(key);
    % Iterate over each value in the values array
    for i = 1:numel(valuesArray)
        value = valuesArray(i);
        disp(value);
    end
    
    disp('-----------ended------------------')
end
     1

     2

     3
-----------ended------------------
    {'value1'}

    {'value2'}

    {'value3'}
-----------ended------------------
    10

    20

    30

    40
-----------ended------------------