How do I change the iteration variable of the for loop?

Is there any way to change the iteration of the forlooplimit in the code? I tried this:

for j = 1:a-b
 plot(Position(1, j), Position(2, j), 'r.');
    if (Position(1, j) >= 50)
       Position(1,j)=[];
       b=b+1;
    end;
end;

but it's not working since my Positionmatrix changes size and the index j get's out of bound.

Answer 1

[Thorsten]

It's not possible. Use a while loop instead:

j = 1;
while j < = a - b
 plot(Position(1, j), Position(2, j), 'r.');
 if Position(1, j) >= 50
   b = b + 1;
 end
 j = j + 1;
end

[Ottavia Rossini]

ok thanks! i'll try that :)