I have a 2D array of strings, I convert it to a numeric array, and then I parse it back with the for loop and use it that way. But my problem is that if the value added to the last index is equal to the new value entered from numerical control, I want the last index to be deleted, but I was not successful.I researched many topics but could not find exactly how to do this. Is there anyone who can help with this? ideas on this topic are really valuable.

It seems you probably want to prevent the array from filling with millions of rows per second (because you loop has no wait!) and there are much better ways to do that (e.g. an event structure as mentioned). Still if you want to keep polling, here's a simple draft. Yes there are better ways to solve your problem once you define the problem better. 😉 You also need to decide if the values entered before running should be added or not (hint: initialize the feedback node with e.g. NaN) Please explain how this part of the code fits into the rest of your code