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

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...

Answer 1

[Cris LaPierre]

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.

[Riccardo Tronconi]

posted my code.

[Cris LaPierre]

The error is in this line:

if (thor{i,1} - F2{j,1}) > duration('00:00:02.000000000')

Since you manipulate j, I wonder if that is becoming a negative number at some point. Then, when you try to index F2 with a negative number, you get this error.

[Riccardo Tronconi]

It never becomes a negative value.

Every each iteration, j increases at greatest by 10. At this point, with i = 2, j should be equal to 7

[Riccardo Tronconi]

thor{i,1} = '05-Mar-2021 11:41:36.619605504'

and F2= '05-Mar-2021 11:41:36.619605504'

'05-Mar-2021 11:41:36.779090944'

'05-Mar-2021 11:41:36.925952768'

'05-Mar-2021 11:41:37.099439104'

'05-Mar-2021 11:41:37.289936640'

'05-Mar-2021 11:41:37.405876736' -> last value which verifies the if statement

(j=6, so when i=2; j restarts from 3)

'05-Mar-2021 11:41:37.556696320'

'05-Mar-2021 11:41:37.711223040'

'05-Mar-2021 11:41:37.878087936'

[Cris LaPierre]

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.

[Cris LaPierre]

Ok, here are some more details. Right before the error happens, here are the values:

i=3
j=79328
prova=1
counter2=79321

I've attached the full list.