The logical indices contain a true value outside of the array bounds

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University 2024-2-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2082753-the-logical-indices-contain-a-true-value-outside-of-the-array-bounds

评论： University 2024-2-16

sol_active_flow_varinying_xiL.mat

Please, how can I tackle "The logical indices contain a true value outside of the array bounds" error? I don't what exactly is the cause.

load('sol_active_flow_varinying_xiL.mat')
xi=xivals;
L =Lvals;
intabsul = intabsul;                 
intabsur =intabsur;        
absintul =absintul;        
absintur =absintur;         
%% This is where I having an issue
test1 = intabsul == absintul & intabsur == absintur;
subset_xi_1 = xivals(test1);
The logical indices contain a true value outside of the array bounds.
subset_Lv_1 = Lvals(test1);
test2 = intabsul ~= absintul & intabsur ~= absintur;
subset_xi_2 = xivals(test2);
subset_Lv_2 = Lvals(test2);
%
test3 = intabsul ==absintul & intabsur ~= absintur;
subset_xi_3 = xivals(test3);
subset_Lv_3 = Lvals(test3);
%
test4 = intabsul ~= absintul & intabsur == absintur;
subset_xi_4 = xivals(test4);
subset_Lv_4 = Lvals(test4);

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Fangjun Jiang 2024-2-16

This is the exact same question you asked previously. The cause of the problem has been clearly explained with a simple example. You have your data and you can run your code line by line, observe the value of the variable and see what is not expected and figure out a solution.

Without comments and with those confusing variable names, it's really hard to try to understand what the program tries to achieve. If you want help, you have to explain to an extent that others can understand.

University 2024-2-16

Sorry, Fangjun. From the above explanation, deos mean that xivals has to 20 by 20 matrix for it work?? I just want to get the values of xivals and Lvals if this contidition: "intabsul ~= absintul & intabsur ~= absintur" is satisfied My xivals and Lvals is a vecor of length 20 each.

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Answer 1

Fangjun Jiang 2024-2-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2082753-the-logical-indices-contain-a-true-value-outside-of-the-array-bounds#answer_1410458

编辑：Fangjun Jiang 2024-2-16

在 MATLAB Online 中打开

test2 = intabsul ~= absintul & intabsur ~= absintur

the resulting "test2" is a 20x20 logical matrix. You can't use it to index a vector of 20 elements.

Do you actually want the index only if the "whole column" or "whole row" of "test2" is all true? If yes, you need to use the all() function, apply it on the column or row.

In this cases, there are three rows of "test2" are all true

test2 = intabsul ~= absintul & intabsur ~= absintur;
index=all(test2,2);
subset_xi_2 = xivals(index)
subset_Lv_2 = Lvals(index)
subset_xi_2 =
  111.8421  118.4211  125.0000
subset_Lv_2 =
   1.0e-05 *
    0.5967    0.6317    0.6667