String in a Loop

Question

DARLINGTON ETAJE 2022-8-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1781075-string-in-a-loop

编辑： dpb 2022-8-18

Hi Everyone,

Please help me out. I am trying to get the loop to work but am getting errors: Index exceeds the number of array elements. Index must not exceed 1. The In_Use_Legend is not working...

hgdawe='OneTwoThreeFourFiveSixSevenEightNine';
bbT=[1;4;7;12;16;20;23;28;33];
ccT=[3;6;11;15;19;22;27;32;36]
LL=size(ccT,1);
for i=1:1:LL
    In_Use_Legend=hgdawe(bbT:ccT);              
    plot(app.UIAxes2,In_Use_VertSec,In_Use_TVD,'DisplayName',In_Use_Legend);
end

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Answer 1

dpb 2022-8-17

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在 MATLAB Online 中打开

In

In_Use_Legend=hgdawe(bbT:ccT);

you didn't subscript your lookup array variables but refer to the arrays each in their entirety.

To make the above work would be

In_Use_Legend=hgdawe(bbT(i):ccT(i));

But, this is the wrong way to do something of the sort; as you're discovering char() arrays are arrays and need both indices and this is inconvenient at best.

Use cellstr() or the new(ish) string class here instead --

lgndName={'One','Two','Three','Four','Five','Six','Seven','Eight','Nine'};    % cellstr array
for i=1:numel(hgdawe)
  plot(app.UIAxes2,In_Use_VertSec,In_Use_TVD,'DisplayName',lgndName(i));
end

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DARLINGTON ETAJE 2022-8-18

在 MATLAB Online 中打开

Thanks dpb

The problem is that the code works perfectly on script but fails in the app designer

Here is the code on MATLAB script:

hgdawe='OneTwoThreeFourFiveSixSevenEightNine';
bbU=[1;4;7;12;16;20;23;28;33];
ccU=[3;6;11;15;19;22;27;32;36];
ddU=[bbU ccU];
Finals=([]);
for i=1:1:9
    bbD=bbU(i);
    ccD=ccU(i);
    Groupings=hgdawe(bbD:ccD);
    Finals=[Finals string(Groupings)];
end

Here is the same logic on MATLAB App Designer which fails

 for iyy=1:1:nL
     bbT=ssfT(iyy);
     ccT=sscT(iyy);  
     In_Use_Legend=hgdawe(bbT:ccT);
     Finalsz=[Finalsz string(In_Use_Legend)]; 
 end
 

The error I get in the app designer is: Index exceeds the number of array elements. Index must not exceed 1.

What do I do?

dpb 2022-8-18

编辑：dpb 2022-8-18

Show us the whole thing and the error message in context -- in isolation we can't tell what it's complaining about -- and there are too many pieces undefined in the posted code snippet to guess.

But again, using a cellstr() insthead of char() array here is by far the better coding choice.

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