Any tips to updating 'for loop' index!

Hi, I have an issue while writing a code for a similar situation which is making the 'for loop' repeat again if the index variable updated its value within the loop! for instance, I want the 'for loop' for 'y' to repeat if a flag reach!

Any tips or best approach to implement it! Thanks!

check2nd_t=1;
for x=1:10
  %some code
  for y=1:10
    %if abv(x) >= abb(y)
    for z=1:10
      if abv(x) > abc(z)
        %done
        break;
      end
      if y==10 & z==10 & check2nd_t ~=2      %is it && would make any change!?
        check2nd_t=2;
        y=1;    %***my main point, I want the y loop to repaet again***
        %some code
      end
    end
    %some code
  end
end

Answer 1

[Walter Roberson]

check2nd_t=1;
for x=1:10
  %some code
  do_again = true;
  while do_again
      do_again = false;
      for y=1:10
        %if abv(x) >= abb(y)
        for z=1:10
          if abv(x) > abc(z)
            %done
            break;
          end
          if y==10 & z==10 & check2nd_t ~=2      %is it && would make any change!?
            check2nd_t=2;
            do_again = true;
            break;
            %***my main point, I want the y loop to repaet again***
            %some code
          end
        end
        if do_again; break; end
        %some code
      end
  end
end

[el-musleh]

Thank you for highlighting this method, it leads me to fix the code and run smoothly! (I'd think of it!)

Answer 2

[per isakson]

The documentation on for says:

Avoid assigning a value to the index variable within the loop statements. The for statement overrides any changes made to index within the loop.

The intention of your loop (from the first version of your question)

for x=1:10
    if x==10
        x=1;
    end
end

may be implemented by

x = 1; % or maybe 0
while x <= 10
    if x==10
        x=1;
    else
        x = x + 1;
    end
end

[el-musleh]

Thank you!

I really forget about it, I though it's possible to change the index within the loop.

I updated the question to be more precise! if you can give any idea/approach to implement it, I will be grateful.

[Image Analyst]

Which of the 3 for loops do you want to repeat? The x, y, or z loop? You should really be using while's instead of for's.

[el-musleh]

I want to repeat the 'y' loop if z and y reach the end.

Yup, I'd used a while loop as well, thanks to Walter Roberson show a code explains it!

Thank you all!