Double for loop is not working properly

Question

Sebastian Engelsgaard 2021-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/728633-double-for-loop-is-not-working-properly

编辑： Sebastian Engelsgaard 2021-1-28

Hi,

I have a 1x12 cell called 'ch' which contains a repeatable pattern as shown in the code below. I assume that the first row of cells in 'ch' repeats twice, however, the 7th column in ch is not using data{1,2}...

Anyone can help?

        for n=1:6:12
                    for k=1:2
                ch{1,n}= data{1,k}(:,14);
                ch{1,n+1}= 1500
                ch{1,n+2}= 'id'
                ch{1,n+3}='name'
                ch{1,n+4}='tag'
                ch{1,n+5}='unit'                
                    end
        end

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Bob Thompson 2021-1-27

What you have posted worked fine for me. The ch{1,7} did capture data{1,2}.

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Answer 1

Daniel Pollard 2021-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/728633-double-for-loop-is-not-working-properly#answer_607618

k will take the values [1 2]. For the first iteration of k, it stores data{1,1}(:,14) in ch{1,n}. The second time around, it will store data{1,2}(:,14) in ch{1,n}, overwriting what was previously done. The data associated with k=1 is never stored.

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Bob Thompson 2021-1-27

在 MATLAB Online 中打开

I think you can actually just combine it down to one loop

for k=1:2
    ch{1,(k-1)*6+1}= data{1,k}(:,14);
    ch{1,(k-1)*6+2}= 1500
    ch{1,(k-1)*6+3}= 'id'
    ch{1,(k-1)*6+4}='name'
    ch{1,(k-1)*6+5}='tag'
    ch{1,k*6}='unit'                
end