Problems in running for loop on keys on container maps

Question

Tsz Tsun 2022-8-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1781980-problems-in-running-for-loop-on-keys-on-container-maps

评论： Tsz Tsun 2022-8-19

Hi all, I am very new to matlab and I have some problems in using container map. I have a ketSet with grid index 1,1 1,2 1,3 and I would like to run a for loop on that to do some dot product. My question is in the for loop p = 1:2, how can I cast the index into the numerical key of the map?

keySet = {'1,1', '1,2', '1,3'};
%use cell array
valueSet = {[2 3], [3 4], [9,6]};
M = containers.Map(keySet,valueSet);
for p=1:2
    dot(M('1,p'),M('1,p+1'))
end
Error using indexing
The specified key is not present in this container.

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Answer 1

Bruno Luong 2022-8-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1781980-problems-in-running-for-loop-on-keys-on-container-maps#answer_1029140

在 MATLAB Online 中打开

keySet = {'1,1', '1,2', '1,3'};
%use cell array
valueSet = {[2 3], [3 4], [9,6]};
M = containers.Map(keySet,valueSet);
for p=1:2
    dot(M(sprintf('1,%d',p)),M(sprintf('1,%d',p+1)))
end
ans = 18
ans = 51