exit from a nested while loop after having set its index to a given value

Question

Riccardo Tronconi 2021-6-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/850995-exit-from-a-nested-while-loop-after-having-set-its-index-to-a-given-value

编辑： Cris LaPierre 2021-6-9

I would like to exit from a nested while loop with return but before I would like to set my index to a given value as it follows:

function [H12] = samehorizon(F1,F2)
%UNTITLED Summary of this function goes here
%   Il counter non si azzera mai e non riesco a incrementare l'indice i 
alltime= [F1{:,1};F2{:,1}];
t1= min(alltime); 
t2= max (alltime); 
thor= t1: seconds(1):t2; 
thor=thor';
thor=array2table(thor);
A= zeros(height(thor), 7);
H12= array2table(A);
H12.A1 = NaT(height(thor),1,'Format', 'dd-MMM-yyyy HH:mm:ss.SSSSSSSSS' );
prova=1; 
for i=1:height(thor)
    j=prova;
    counter2=0; 
    Xtot2=0;
    Ytot2=0;
    H12(i,1)= thor(i,1);
    H12(i,5)= F2(1,2);
    
   while j <=height(F2)
        
        if j== height(F2)              
            break 
        end  
      
         if (thor{i,1} - F2{j,1}) > duration('00:00:02.000000000')
            prova=j-3;
            break 
         end 
      if thor{i,1} - F2{j,1} <= duration('00:00:01.000000000')
            Xtot2= Xtot2 + F2{j,3};
            Ytot2= Ytot2 + F2{j,4};
            counter2= counter2+1;
            Xmean2 = (Xtot2/counter2); 
            Ymean2= (Ytot2/counter2); 
            H12{i,6}= Xmean2; 
            H12{i,7}= Ymean2;                       
      end
     
      j=j+1; 
    end         
end
end

The error is: Index in position 1 is invalid. Array indices must be positive integers or logical values. referred to this line. In fact, prova always is equal to one...

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Answer 1

Cris LaPierre 2021-6-8

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/850995-exit-from-a-nested-while-loop-after-having-set-its-index-to-a-given-value#answer_719880

在 MATLAB Online 中打开

We don't have enough data to run your example. However, the error message has to do with how you are indexing height. It would appear either thor or F2 are not a valid index.

a = 1:3;
% valid
a(1)
ans = 1
% invalid
a(1.5)
Array indices must be positive integers or logical values.

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Cris LaPierre 2021-6-9

在 MATLAB Online 中打开

That is may be what you intended, but not what is happening. I included a try-catch to see when the error is occuring. Here are the results.

i = 5
j = -2
thor{i,1} = 05-Mar-2021 11:41:40.619605504
F2{j,1} =
Error using Untitled>samehorizon (line 114) % (this is my test script)
Index in position 1 is invalid. Array indices must be positive integers or logical values.