Index in position 1 exceeds array bounds (must not exceed 26)

Question

Addisu Anteneh Dilnessa 2020-6-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/555340-index-in-position-1-exceeds-array-bounds-must-not-exceed-26

回答： Walter Roberson 2020-6-26

hello guys, i am trying to run the following code but it says "Index in position 1 exceeds array bounds (must not exceed 26)."

theta_post_2=[beta_post_prod1,sigma2_post_prod1];
sigma2_start = 1;
lblx = {'CONSTANT';'Head_Sex'; 'Edu';'HHsize'; 'Offfarm';'Distance_output';'Distance_Input';'Asset_Value';'Plot_Size' ;'Plot_Distance';'Seed_Value' ; 'Remit';'Confid';'Credit';'highfer';'mediumfer';'flatslop';'Slightslop';'Sever_err' ;'Mild_err';'Tenur';'Pulses';'Cereals';'Femalehr';'Malehr';'Improved_Var'};
disp('');
disp('                         GIBBS SAMPLER RESULTS                            ');
disp('=============================================================================');
disp('                  Beta       sd      Prctile 2.5   Prctile 97.5 ');
for i=1:size(theta_post_2,2)
fprintf('%-10s %11.4f %11.4f %11.4f %11.4f\n', ...
         lblx{i,1}, [mean(theta_post_2(:,i)), std(theta_post_2(:,i)), prctile(theta_post_2(:,i), 2.5), prctile(theta_post_2(:,i), 97.5)]);
end
disp('-----------------------------------------------------------------------------');
disp(['Number of obs:          ' num2str(N)]);
disp(['Number of replications: ' num2str(reps)]);
disp(['Burn-in length:         ' num2str(burn)]);
disp(['Starting value:         ' num2str(sigma2_start)]);
disp('=============================================================================');

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Answer 1

the cyclist 2020-6-26

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在 MATLAB Online 中打开

You haven't provided enough info to run your code, which would make debugging much easier. You also didn't tell us which line gives that error.

But, I notice that your varialbe lblx is length 26.

So, I am going to guess that the error comes from this expression:

lblx{i,1}

and that the variable i in the for loop gets to be larger than 26, because theta_post_2 is larger than length 26.

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Answer 2

Walter Roberson 2020-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/555340-index-in-position-1-exceeds-array-bounds-must-not-exceed-26#answer_457612

在 MATLAB Online 中打开

lblx = {'CONSTANT';'Head_Sex'; 'Edu';'HHsize'; 'Offfarm';'Distance_output';'Distance_Input';'Asset_Value';'Plot_Size' ;'Plot_Distance';'Seed_Value' ; 'Remit';'Confid';'Credit';'highfer';'mediumfer';'flatslop';'Slightslop';'Sever_err' ;'Mild_err';'Tenur';'Pulses';'Cereals';'Femalehr';'Malehr';'Improved_Var'};

That is 26 entries in lblx.

for i=1:size(theta_post_2,2)
fprintf('%-10s %11.4f %11.4f %11.4f %11.4f\n', ...
         lblx{i,1}, [mean(theta_post_2(:,i)), std(theta_post_2(:,i)), prctile(theta_post_2(:,i), 2.5), prctile(theta_post_2(:,i), 97.5)]);
end

lblx{i,1} is used up to lblx(size(theta_post_2,2), 1). But as outside observers, we have no reason to know that size(theta_post_,2) is at most 26.

theta_post_2=[beta_post_prod1,sigma2_post_prod1];

I wonder if that should be

theta_post_2 = [beta_post_prod1; sigma2_post_prod1];