How to get out of the for cycle and start all over again?

Good morning,

first of all I apologize for my poor English, however:

I have to run a matlab program already done, this program is given some inputs (a = 1, B = 2 ...), then I with an if cycle check if the results are good. If the results are not good I want you to update the inputs (for example put a = a + 1 etc.) and then go back to the lines of the previous program to redo the calculations again. What I can't do is go back to a previous line in the program. Can someone help me?

To get a better understanding of what the problem is, I will give an example:

Answer 1

[Walter Roberson]

a = 1;
while true
    B = a*23+54 ;
    if B < 89
        a = a+1;
        continue;
    end
end

Or more cleanly,

a = 1;
B = a*23+54 ;
while B < 89
    a = a + 1;
    B = a*23+54 ;
end

[Simone Fratton]

I'm looking for a way to start again from line 2, ok that in the example the problem could be so, but a command start from ... just doesn't exist?

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/26949-matlab-goto-statement