Compare Strings in a loop

Question

Kaan Aydin 2020-8-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/580059-compare-strings-in-a-loop

评论： Kaan Aydin 2020-8-16

采纳的回答： Rik

在 MATLAB Online 中打开

Hello everybody,

I have the followong question.

In a struct I have two cell arrays CellA and CellB. These cell arrays are identically built and contain the information "DataA, DataB, Name"

What I want to do ist to compare the strings of "Name" of both Cell arrays. If they are the same I want to calculate CellA.DataA - CellB.DataA

The calculated values are saved in a third cell array CellC. This is my actual script.

i=length(data.CellB);
a=1;
for k = 1:length(data.CellA)
    while a < i
        tf = strcmp(data.CellA{k, 1}.Reifen, data.CellB{a, 1}.Reifen);
        if tf == 1
             data.CellC{k,1} = data.CellA{k, 1}.DataA - data.CellB{a, 1}.DataA;
            data.CellC{k,2} = data.CellA{k, 1}.DataA - data.CellB{a, 1}.DataA;
            data.CellC{k,3} = data.CellA{k, 1}.DataB - data.CellB{a, 1}.DataB;
            data.CellC{k,4} = data.CellA{k, 1}.DataB - data.CellB{a, 1}.DataB;
            a=a+1;
        else 
            data.Pegeldelta{k, 1}=0;
            data.Pegeldelta{k, 2}=0;
            data.Pegeldelta{k, 3}=0;
            data.Pegeldelta{k, 4}=0;
        end
    end
end

But it seems like I´m stuck in an endless loop.

I think the problem is at "a". After the a=a+1 iteration it doesn´t get set back "a" so the loop doesn´t start again at 1 for the next comparison.

Hope you can help me with this.

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Answer 1

Rik 2020-8-15

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/580059-compare-strings-in-a-loop#answer_480438

在 MATLAB Online 中打开

If you know the number of interations, why not use a for loop again?

for k = 1:size(data.CellA,1) %use size(___,dim) instead of length() to get predictable behavior, use numel if you want all elements
    A = data.CellA{k, 1}; %make the code more readable with a temp variable
    for a = 1:size(data.CellB,1)
        B = data.CellB{a, 1};
        tf = strcmp(A.Reifen, B.Reifen);
        if tf %don't compare a logical to 1
            data.CellC{k,1} = A.DataA - B.DataA;
            data.CellC{k,2} = A.DataA - B.DataA;
            data.CellC{k,3} = A.DataB - B.DataB;
            data.CellC{k,4} = A.DataB - B.DataB;
        else 
            data.Pegeldelta{k, 1}=0;
            data.Pegeldelta{k, 2}=0;
            data.Pegeldelta{k, 3}=0;
            data.Pegeldelta{k, 4}=0;
        end
    end
end