While Loop not running

The following is while loop code that I have written for a project. No errors are popping up when and everything with the code appears to be fine but it never actually completes running. I am very stuck and would greatly appreciate some help. Here is my code:

i=3;
while i <= length(Datamatrix)
if isTwoInsideDays == true
            L_entry_price = prevInsideDayHigh(i) + 0.0010;
            L_stop_loss = prevInsideDayLow(i) - 0.0010; % Stop 10 pips below
            L_take_profit = L_entry_price + 2 * (L_stop_loss - L_entry_price);
            i=i+1;
            while Close>L_entry_price==false;
                i=i+1;
            end
            Signal(i)=1;
            i=i+1;
    while (Close(i) > L_take_profit || Close(i) < L_stop_loss) == false
        i=i+1;
    end
    Signal(i)=-1; 
end
end

[VBBV]

Use an if-statement, in place of while loop, since inner while loops never finish, with the stopping criteria is not satisfied.

i=3;
while i <= length(Datamatrix)
    if isTwoInsideDays == true
                L_entry_price = prevInsideDayHigh(i) + 0.0010;
                L_stop_loss = prevInsideDayLow(i) - 0.0010; % Stop 10 pips below
                L_take_profit = L_entry_price + 2 * (L_stop_loss - L_entry_price);
                i=i+1;
                
                if Close(i)>L_entry_price; % use an if-statement (close(i))
                    i=i+1;
                end
                Signal(i)=1;
                i=i+1;
                if (Close(i) > L_take_profit | Close(i) < L_stop_loss) % use if-statement 
                    i=i+1;
                end
                Signal(i)=-1; 
    end
end

[Torsten]

while Close(i)>L_entry_price==false;
   i=i+1;
end

while (Close(i) > L_take_profit || Close(i) < L_stop_loss) == false
   i=i+1;
end

versus

if Close(i)>L_entry_price; % use an if-statement (close(i))
  i=i+1;
end

if (Close(i) > L_take_profit | Close(i) < L_stop_loss) % use if-statement 
  i=i+1;
end

Note that the "i" in the if-statement will be increased at most once while it will be increased as long as the condition becomes false in the while-loop .

Thus the two formulations are not equivalent.

[VBBV]

i=3;
if i <= length(Datamatrix)
  if isTwoInsideDays == true
              L_entry_price = prevInsideDayHigh(i) + 0.0010;
              L_stop_loss = prevInsideDayLow(i) - 0.0010; % Stop 10 pips below
              L_take_profit = L_entry_price + 2 * (L_stop_loss - L_entry_price);
              %i=i+1;      
              while Close(i)>L_entry_price; % use an if-statement (close(i))
                  i=i+1;
              end
              Signal(i)=1;
              i=i+1;
              while (Close(i) > L_take_profit | Close(i) < L_stop_loss) % use if-statement 
                  i=i+1;
              end              
Signal(i)=-1; 
  end
end

Yes, possibly correct from your previous comments , that the first if-statement is never true after entering first while loop. Since the code is not given complete , it's difficult to tell how other variables are interdependent in rest of the code (not shown). In this case the best guess is outer while loop may not be necessary.

Answer 1

[Voss]

This loop will never terminate if entered

while Close>L_entry_price==false;

i=i+1;

end

because only i changes. Close and L_entry_price do not change with i, so the condition is always true if it's true initially.

Should it be like this?

while Close(i)>L_entry_price==false;

i=i+1;

end

or, perhaps more straight-forward:

while Close(i) <= L_entry_price

i=i+1;

end

[Marshall]

I tried both of those ways and unfortunatly did not see a change. Any other suggestions you might have would be greatly appreciated!

[Torsten]

Maybe "isTwoInsideDays" is false and "length(Datamatrix)" is >= 3 ?

Then you will never escape the main outer while-loop.

If the problem remains, we need to be able to reproduce the error with complete executable code.

[Voss]

I would add a breakpoint before the outer while loop and step through the code as it runs to see what's going on.

https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html#mw_aac9fccc-eee5-48d5-9c1e-36a598251c93